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Presence sensors are better when an automation must know that someone remains in a room; motion sensors are better when a brief movement event is all that matters. A motion sensor can turn on a hallway light when you walk past, but it may report “clear” after you sit at a desk or fall asleep. A presence sensor, usually using 60GHz millimeter-wave (mmWave) radar, can continue reporting occupancy from tiny movements such as breathing or a small posture shift.
For many homes, the most dependable design is hybrid: use PIR motion for an immediate trigger and mmWave presence to keep the room occupied until it is genuinely empty. The right choice depends on the room, power source, privacy expectations, controller, and how much calibration you are willing to do.
Motion is an event; presence is a state
What a motion sensor reports
A motion sensor answers a short-term question: Did something move through this area? Most residential models use passive infrared (PIR), which notices changes in infrared radiation as a warm body crosses its detection zones. Some products also use ultrasonic or microwave sensing. A PIR unit is excellent at detecting a person entering a hallway, crossing a doorway, or approaching a camera zone.
Its output is normally an event followed by a timeout. After detecting movement, the sensor reports motion for a configured period; if no new movement crosses its zones, the room becomes “clear.” That behavior is efficient for lighting and security triggers, but it does not prove that everybody has left.
#1 Best Overall
- [Precise AI-Powered Presence Sensor] Powered by advanced AI, PIR, and 60GHz mmWave radar, the FP300 accurately detects human presence even when you’re still. Its adaptive AI learning continuously optimizes sensitivity to reduce false triggers, ensuring lights and devices stay on even when you’re lounging on the couch, and off when they need to be.
- [Broad Compatibility] Supports Matter over Thread and Zigbee for seamless integration with major ecosystems. Works with Apple Home, Home Assistant, Alexa, Google Home, SmartThings, and Homey via Matter for flexible, reliable automation. (* For third-party Matter ecosystems, a corresponding Thread Border Router and Matter Controller are required. * For Aqara, a Zigbee 3.0 or Matter hub like M200/M3/G410/etc, except G2H, with the latest firmware is needed.)
- [5-in-1 Multi-Sensor] Combines 60GHz mmWave, PIR, light, temperature, and humidity sensors into one compact device. This all-in-one design enables precise detection of presence and environmental conditions, helping automate lighting, climate control, and security systems for a smarter and more energy-efficient home.
- [Long Battery Life & Energy Efficiency] Powered by two replaceable CR2450 batteries, the FP300 offers up to 3 years of battery life in Zigbee mode or 2 years in Thread mode. Optional sensor deactivation helps conserve energy, ensuring consistent and long-lasting performance. What's Included: FP300 Multi-Sensor × 1, Sticker × 1, User Manual × 1
- [Wire-Free & Flexible Installation] Completely wireless with a multi-axis adjustable mount for easy wall, ceiling, or corner setup. No wiring required—relocate anytime for optimal detection and coverage. Featuring a 120° field of view and up to 6 m (20 ft) of detection range, the FP300 can effectively monitor various room layouts. Its minimalist design blends seamlessly into any modern interior, delivering powerful functionality without visual clutter.
What a presence sensor reports
A presence sensor answers a different question: Is somebody still here? MmWave radar analyzes reflections to detect very small movements, including breathing and subtle body shifts. It can therefore maintain an occupied state while a person is reading, working at a desk, watching television, or sleeping.
Manufacturers use different state names and timeout logic, so “presence” is not an industry-wide accuracy guarantee. It is an occupancy-oriented signal that must still be installed and calibrated correctly. Walls, furniture, moving curtains, fans, pets, and reflections can affect the result.
Aqara summarized the distinction in 2025: “A presence sensor detects very subtle human presence, including small movements like breathing, whereas a motion sensor detects larger movements, like someone walking.”
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Why lights switch off while you are sitting still
A PIR light automation often has this sequence: motion detected, light on, countdown starts, no large movement, countdown expires, light off. Waving an arm may restart the timer, but the underlying problem remains. Replacing the PIR with a presence sensor, or adding presence as a second condition, allows the automation to distinguish “no recent motion” from “nobody is in the room.”
How the sensing technologies differ
PIR: simple and efficient
PIR sensors divide their view into zones and detect changes between those zones. They generally need a moving heat source, which makes them predictable for people walking across the field of view. They use little power and are commonly battery-operated. Detection can be weaker when a person walks directly toward the sensor, sits outside the active zones, or is masked by furniture.
MmWave radar: sensitive to small movement
MmWave devices transmit radar signals and interpret their reflections. They can detect a stationary person’s minute movements and, on advanced models, track more than one target or divide a room into software-defined zones. Continuous radar processing usually requires more power than a basic PIR circuit, so many mmWave products use mains power. Battery-powered hybrids are emerging, but their quoted runtime depends on reporting intervals and other laboratory assumptions.
Ultrasonic and microwave motion sensing
Some motion products use ultrasonic or lower-frequency microwave techniques rather than PIR. These can detect movement without relying on a temperature contrast, but behavior varies by model. Check the manufacturer’s specified range, mounting restrictions, and sensitivity controls instead of assuming that every non-PIR device behaves like an mmWave presence sensor.
Rank #2
- [Multiple Detection Zones & Headcount Automations] A single FP400 can replace multiple traditional presence sensors by dividing large spaces into independent custom zones with real-time headcount tracking for up to 10 people. Leveraging precise location, zone tracking, and occupant counts, you can create tailored automations—such as lighting up the kitchen island upon approach, activating a movie scene when someone is detected in the sofa zone, or adjusting A/C based on how many people are in a room.
- [AI Spatial Understanding & Adjustable Sensitivity] No longer will lights randomly turn on from a blowing curtain or shut off while you’re lounging on the couch. With next-gen 60GHz mmWave radar that has 5x the point-cloud density of previous generations, the FP400 combines AI background learning with 3 adjustable sensitivity levels. Set high sensitivity in study or reading zones to capture micro-movements to keep the lights on, and lower it in high-traffic areas to filter out environmental noise, drastically reducing false triggers for highly reliable occupancy tracking.
- [Matter over Thread & Zigbee Connectivity] FP400 supports Thread+Zigbee, compatible with Apple Home, Home Assistant, Google Home, Alexa and SmartThings. With a Thread Border Router, up to 8 custom zone occupancy sensors can sync directly to your Matter platform(*Aqara Home App v6.4.1+ is needed. Availability differs by device/platform.)
- [AI-Assisted Spatial Setup] Setting up multi-zone radar tracking no longer requires complex environmental calibration or tedious grid drawing from scratch. Using AI enhanced software, the FP400 identifies and generates room boundaries, entrance/exit doors, and learns to exclude background noise in real time. Create and define your custom automation zones in under a minute, ensuring a quick, easy setup experience for your space.
- [Flexible Mounting & 120° Wide Coverage] Eliminate dead zones in any room layout with ultimate placement flexibility. Featuring a 120° ultra-wide field of view and a magnetic base, the FP400 supports side, corner, ceiling mounting. Achieve up to a 10×8m(32.8×26.2 ft) detection reach when side-mounted, a full 7x7m (23x23 ft) sweep to cover entire room corners, or a 5-6m ceiling zone at a 3m (10 ft) height—delivering optimized, privacy-friendly coverage across versatile spaces.
Presence versus motion: practical trade-offs
| Decision axis | Presence sensor, often mmWave | Motion sensor, often PIR |
|---|---|---|
| Automation question | “Is somebody still here?” | “Did somebody move through this area?” |
| Best locations | Bedrooms, offices, living rooms, and desk or sofa zones | Hallways, entrances, driveways, and simple security triggers |
| Stillness | Can detect subtle movement and maintain occupancy | May time out when a person remains still |
| Power | Often continuous power; battery hybrids are emerging | Frequently battery-powered |
| Setup | More placement and calibration sensitivity; zones may require a hub or app | Simpler placement and lower configuration burden |
| Privacy | Radar-based products can avoid cameras | PIR also avoids cameras |
| Typical trade-off | Better occupancy continuity, with higher cost and power needs | Lower power and simpler deployment, with less reliable still-occupant detection |
Aqara’s category guidance lists presence detection up to 8 meters and motion detection typically 4–7 meters. Treat those figures as manufacturer guidance, not universal limits: field of view, mounting height, firmware, room geometry, and the exact model change the usable area.
Choose by room and automation goal
Hallways, stairs, and entrances
Use a PIR motion sensor when the objective is to start a timer as someone passes. A wide viewing angle reduces blind spots, and battery operation keeps installation simple. Presence sensing is usually unnecessary unless the area is also used as a waiting or seating space.
Home office or desk
Choose presence sensing if lights, ventilation, or climate control must stay active while you work without moving. Mount the sensor so the desk and chair are inside its intended zone, then tune sensitivity and timeout to prevent detection of movement through an adjacent doorway.
Living room and television area
MmWave presence is useful when occupants sit quietly for long periods. A PIR can still provide the quickest “room entered” trigger, while presence prevents the lights from switching off during a film. If the sensor supports zones, define the sofa and television area separately from the doorway.
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Bedroom
Presence detection can keep nighttime lighting, climate, or safety automations active while someone is sleeping. Avoid aiming a highly sensitive sensor through a wall into another bedroom, and test whether bedding, fans, or a moving curtain produce false occupancy.
Outdoor approaches and security zones
For a driveway, porch, or gate, a motion event is usually the useful signal for a light or camera. Outdoor temperature changes, sunlight, rain, and moving vegetation can make indoor-style presence products unsuitable unless the model is explicitly rated for that environment.
Product examples and what their specifications mean
| Product | Sensing and view | Power and connectivity | Best fit and limitations |
|---|---|---|---|
| Aqara Presence Multi-Sensor FP300 | Combines PIR with 60GHz mmWave; 120° field of view; maximum detection range stated as 6 m | Two replaceable CR2450 batteries; battery life stated up to three years in Zigbee mode or two years in Thread mode | Hybrid fast trigger plus stationary-presence detection. Runtime figures come from laboratory tests with defined reporting assumptions, so actual life varies. |
| Aqara Motion and Light Sensor P2 | PIR motion sensing; 7 m range; 170° angle; integrated light sensor | Thread; about two years from two CR2450 cells | Hallways, entrances, and illuminance-based lighting. It is a motion sensor, not a guarantee that a seated person remains detected. |
| Aqara Spatial Multi-Sensor FP400 | 60GHz mmWave with AI sensing, multi-target tracking, and up to eight custom zones in Aqara Home with a compatible hub | Exact power and regional capabilities depend on the configuration | Advanced room zoning. Aqara strongly discourages direct third-party Matter setup without Aqara Home because that limits available features. |
These specifications describe the manufacturers’ stated capabilities. They do not establish a universal accuracy percentage, and firmware, regional certification, and integration support can change.
Rank #3
- RADAR + PIR + LIGHT SENSOR The presence sensor uses dual identification technology (PIR + radar) to improve detection accuracy. Radar technology can improve detection accuracy, and light sensors provide more flexibility and fun in light automation.
- ZigBee Hub Required The motion sensor requires a ZigBee hub to connect and act as a central bridge for all ZigBee smart devices. It has a stable signal and integrates seamlessly with other ZigBee devices, significantly improving comfort and flexibility.
- High Sensitivity: Precise detection of people, animals and more in the detection area. Built-in light sensor. When detected, an alarm is triggered immediately.
- EASY TO INSTALL The battery powered motion sensor is easy to install and small enough to be used in many places. Note: Do not point the device at objects with strong airflow or movement.
- Multi-purpose: ideal for use in living areas, entrance areas, passage areas as well as in wet rooms such as basements, toilets, bathrooms.
Designing a hybrid automation
A hybrid arrangement uses each technology for the job it handles best: PIR supplies a fast transition from vacant to active, and mmWave supplies a slower, occupancy-oriented decision. This reduces the delay that can occur when a presence sensor takes time to classify a new target while avoiding the premature shutoff common with PIR-only lighting.
- Trigger quickly with motion. Turn on the entry light or start the room automation when PIR reports motion.
- Confirm or maintain occupancy with presence. Keep the room in an occupied state while mmWave reports a target in the configured zone.
- Use a deliberate clear delay. Require both no recent motion and no detected presence for a grace period before switching lights or climate control off.
- Separate zones where possible. Exclude a hallway, doorway, or neighboring room from the seated zone so activity outside the room does not hold the room open.
- Add manual override and recovery. A wall switch or app control should be able to force the light on or off when sensing is temporarily wrong.
Do not set the clear delay so short that normal classification time turns the lights off. Conversely, an excessively long delay wastes energy after the room is empty. Adjust it to the room’s use: a passageway can clear quickly, while a bedroom or office needs a longer grace period.
Placement and calibration checklist
- Map the actual occupied area. Mark the chair, sofa, bed, and doorway where people spend time. Compare that map with the sensor’s stated field of view and maximum range.
- Mount at the recommended height and angle. Follow the model’s instructions rather than assuming a ceiling, wall, or shelf position is interchangeable.
- Keep the target zone unobstructed. Large furniture, cabinets, partitions, and appliances can block or reflect radar and can create PIR blind spots.
- Check adjacent spaces. Test whether the sensor sees through an open doorway or thin partition. If it does, create a zone mask or move the sensor.
- Test stillness. Sit, read, and lie down for longer than the planned light timeout. Confirm that the occupancy state remains active.
- Test exits. Leave the room, close the door as you normally would, and measure how long the system takes to clear.
- Test environmental changes. Run fans, move curtains, and check pets or robot cleaners. Adjust sensitivity, zones, or mounting if those conditions create false positives.
- Document the final settings. Record firmware, sensitivity, timeout, zones, and controller pairing so you can restore a known-good configuration after a reset.
Power, privacy, and maintenance
Battery planning
PIR is usually the easier technology for long battery life because it can sleep until an event occurs. MmWave processing and frequent occupancy reports consume more energy. A hybrid battery product may reduce that gap, but quoted life is conditional. For example, the FP300’s stated maximum is up to three years in Zigbee mode and two years in Thread mode under the manufacturer’s laboratory assumptions; treat those as planning figures, not a guarantee.
Install battery sensors where replacement is safe and accessible. A sensor above a stairwell or behind a fixed cabinet may be cheap to install but expensive to maintain. Enable low-battery alerts in the controller and test that an alert is generated before the cell is exhausted.
Camera-free sensing
Both PIR and radar sensors can provide occupancy automation without recording images. That does not mean every implementation is private by default: review what the hub stores, which accounts can access occupancy history, and whether cloud processing is optional. Local processing is preferable when available, especially for bedrooms and work areas.
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Keep lenses and sensor openings clean, check that a moved shelf has not entered the field of view, and re-test after furniture changes. Firmware updates can alter sensitivity or expose new zone controls, so recheck automations after updating.
Matter, Thread, Wi-Fi, and hubs: what you actually need
Thread is transport; Matter is the control protocol
Matter is an application-layer protocol that uses IP networking over transports such as Wi-Fi or Thread. Thread is a low-power mesh network, not a synonym for Matter. A product can carry a Thread logo and still require a manufacturer-specific integration rather than offering Matter commissioning.
Rank #4
- [Multi-Ecosystem Support with Matter] An Aqara Zigbee 3.0 amera Hub G2H pro), the Zigbee Presence Sensor FP1E features Matter-over-bridge support and is also compatible with major third-party platforms, like Homekit, Alexa, Google Home, Home Assistant and Homey. (Note:only supports connectivity with Aqara Hub but not other brands hubs). Zigbee2MQTT and comparable third-party USB dongles are not officially supported by Aqara. Full product functionality may be limited or unavailable.
- [mmWave Radar for Accurate Detection & Wide Coverage] Based on mmWave technology, the mmwave presence sensor FP1E achieves more precise detection compared to most PIR motion sensors. It can detect subtle movements of stationary individuals, preventing false reports in cases of inactivity. Additionally, it reduces response delay, ensuring faster and more immersive automation triggers. It enables a 120° field of view (can reach 180° in close range), up to 6m, covering an area of 35 ㎡, enough to monitor a room in your home.
- [Enhanced Precision with AI Technology] Empowered by Aqara Lab's AI technology, the smart motion sensor can proactively identify and eliminate interference sources like small pets in a space to prevent false alarms. In addition, the AI Spatial Learning capabilities allow the presence sensor FP1E to autonomously to adapt its detection sensitivity to your room, enhancing detection accuracy
- [Easy to set up & Installation ] Simply plug the Human Presence Sensor into a 5V/1A DC adapter (not included) for quick and easy setup in minutes. An Aqara Zigbee 3.0 Hub is required (not included). Its intuitive APP interface makes it easy to use without having to worry about adjusting sensitivity or dealing with sources of interference in your space. Magnetic and adhesive brackets make it easy to mount on a wall, ceiling, or corner.
- [Smart Automation with Detection of Moving and Still Status ] Use it with other Aqara devices for smart automations. The Presence Sensor FP1E accurately detects a human's presence, whether moving or still, within a space, as well as the duration of their status. Unlocking a wide range of automation possibilities triggered by moving/still (Aqara Home app exclusive feature). For exemple, the FP1E works as a reminder of prolonged sitting: if still detected for over 30 min, then send a notification, and change color of light strip.
Home Assistant’s documentation gives the practical warning: “Don’t assume Matter support when you see a Thread logo on a device.” Confirm the Matter logo or the manufacturer’s explicit compatibility statement for the exact model and region.
Border routers and controllers
A Thread sensor needs a Thread-capable border router or equivalent network infrastructure. A Matter device also needs a Matter controller in the ecosystem where you intend to automate it. Depending on the platform, that may be a compatible smart-home hub, speaker, display, or Home Assistant installation. Pairing one device does not automatically make every other controller in the house able to see it.
When a manufacturer hub is required
Some presence products expose only basic states through Matter, while advanced zoning, AI classification, or multi-target controls remain in the manufacturer’s app and hub. The FP400 is an example: its custom zones are configured in Aqara Home with a compatible hub, and Aqara strongly discourages direct third-party Matter setup without that app because feature availability is limited.
Home Assistant’s Aqara integration lists the P2, FP1E, and FP300 among certified Aqara devices and states that Aqara Matter devices communicate locally. Compatibility still depends on the exact model, firmware, region, and controller. Verify all four before purchase.
Common problems and fixes
Lights turn off while someone is present
- Replace the PIR-only condition with a presence condition, or add a mmWave sensor to maintain occupancy.
- Increase the clear delay while the sensor classifies a seated or sleeping person.
- Reposition the sensor so the chair, bed, or sofa is inside the active zone.
- Check for a depleted battery or a disconnected hub that is leaving the automation with stale data.
Lights stay on after everyone leaves
- Inspect the presence zone for a fan, curtain, pet, robot vacuum, or reflection that is being interpreted as a target.
- Reduce sensitivity or mask the doorway and adjacent room.
- Run an exit test and set a maximum occupancy hold or fallback shutoff appropriate to the room.
Motion is detected only when walking sideways
That is typical of PIR zone geometry. Rotate or reposition the unit so people cross its zones rather than approach the sensor head-on, or use a second sensor to cover the blind direction.
The sensor pairs but advanced features are missing
Check whether you commissioned it directly as Matter instead of through the required manufacturer hub. Confirm the firmware and region, then consult the model’s integration matrix. Basic motion or occupancy may work while custom zones, illuminance, or multi-target data remain unavailable.
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Review the mode in use, report frequency, signal strength, and automation polling. Thread and Zigbee runtimes can differ, and laboratory figures assume defined reporting behavior. Reduce unnecessary reports, improve network coverage, and replace the cell only after verifying that the device is not repeatedly reconnecting.
Best Value
- [Notes] An Aqara Hub is required and sold separately. (Not compatible with hubs from other brands.) Requires a secure 2.4GHz Wi-Fi connection for Hub M2, M1S, E1, M1S Gen2, G2H Pro, and G2H; or 2.4/5GHz Wi-Fi for Camera Hub G3. (Hub M2 also supports wired Ethernet via RJ45.)(*Note: To ensure a stable connection, place the Door and Window Sensor main unit between the accessory unit is no more than 22 mm )
- [Proximity] For a sturdy connection, ensure that the Aqara Door and Window Sensor is within 400 inches of the Aqara Zigbee hub, and the hub is within the same range from the Wi-Fi router. Additionally, make sure the hub and the router are on the same local area network (LAN). Zigbee2MQTT and comparable third-party USB dongles are not officially supported by Aqara. Full product functionality may be limited or unavailable.
- [Unauthorized Entry Detection & Home Automation] The Zigbee Door Sensor alerts your phone and triggers the Aqara Hub's local alarm upon unexpected door/window openings. It also controls other Aqara devices based on door/window status. Conveniently check your door or window, kids room and anywhere you want to be notified. ***Requires Aqara Hub，not third-party hub.
- [0.86 Inch Wide Gap Allowed]The Aqara Door and Window Sensor works with most types of doors, windows, and other fixtures with similar mechanism, such as drawers, cabinets, and more.(Note: Please ensure that the surface where you plan to stick the Aqara Zigbee Door and Window Sensor is flat and easily adhesive, and the allowed gap between the door is up to 0.86 inch.) The main sensor unit dimension:1.61*0.87*0.43 inch, the magnet dimension:0.79*0.39*0.39 inch.
- [Hands-Free Voice Control]Compatible with Apple HomeKit, Alexa for a hands-free experience.- no need to go downstairs or pick up your phone again. You'll always know whether your home door is opening or closing (The Aqara Door and Window Sensor is not compatible with SmartThings currently.)
A buying checklist
- Define the signal: Do you need an instant movement event, a persistent occupied state, or both?
- Measure the room: Compare the usable range and field of view with the real seating, sleeping, and doorway positions.
- Choose power deliberately: Use battery PIR where wiring is difficult; plan continuous power for demanding mmWave coverage when practical.
- Check integration layers: Verify Matter support separately from Thread support, and identify any required border router, controller, or manufacturer hub.
- Confirm feature exposure: Ask whether zones, light level, multi-target tracking, and presence states are available in your chosen platform or only in the vendor app.
- Plan privacy: Prefer camera-free sensing and understand where occupancy data is processed and retained.
- Plan recovery: Include manual controls, battery alerts, and a fallback shutoff for incorrect states.
Room-by-room recommendation
| Room or area | Recommended starting point | Reason |
|---|---|---|
| Hallway or stair | Battery PIR motion sensor | Fast entry trigger, low power, and little need to track still occupants |
| Entryway | Wide-angle PIR; add presence only if people wait there | Motion handles arrival; presence is useful for a bench or reception area |
| Office | MmWave presence, optionally paired with PIR | Keeps lights and climate active while a worker remains seated |
| Living room | Hybrid PIR plus mmWave | PIR reacts quickly at entry; presence prevents shutoff during quiet viewing |
| Bedroom | Carefully zoned presence sensor | Tracks sleeping or resting occupants, but needs testing for fans, bedding, and adjacent rooms |
| Driveway or porch | Outdoor-rated motion sensor | Movement is the useful event; indoor presence specifications may not apply outdoors |
Bottom line
Pick a motion sensor when your automation needs to react to movement through a zone, especially in hallways, entrances, and simple security rules. Pick a presence sensor when the automation must remain active while somebody sits, reads, watches television, or sleeps. For rooms where both fast response and reliable occupancy matter, combine PIR and mmWave, then calibrate zones and clear delays.
Before buying, verify the exact range and field of view, power assumptions, Matter certification, Thread infrastructure, controller support, and any manufacturer hub required for advanced features. Those details often determine whether the sensor behaves as expected more than the word “presence” or “motion” on the box.
Frequently Asked Questions
Can a presence sensor detect a person who is completely motionless?
MmWave sensors detect very small movements such as breathing and minor posture shifts, not an abstract human outline. Performance depends on placement, range, target angle, firmware, and environmental interference, so test the actual room rather than assuming guaranteed detection.
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Do I need both Matter and Thread for a smart sensor?
No. Thread is a low-power network transport, while Matter is an application-layer protocol. A Thread device is not automatically a Matter device. Check the exact model’s Matter support, then confirm that your home has the required Thread border router and Matter controller.
Will a PIR sensor work if I sit at a desk?
It may not. PIR generally needs movement across its detection zones, so a still occupant can time out. Increase the automation timeout, reposition the sensor, or use a presence sensor to maintain the occupied state.
Are mmWave presence sensors safe for bedrooms?
They are camera-free radar sensors, but privacy and comfort still depend on the product and installation. Review data handling, keep the sensing zone inside the intended room, and test sensitivity around beds, fans, curtains, and neighboring spaces.
Why does a presence sensor need calibration?
Radar reflections and room geometry vary. Calibration sets detection distance, sensitivity, and zones so the sensor recognizes the chair or bed without treating a doorway, moving curtain, fan, pet, or adjacent room as occupancy.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
