The CuVoodoo USB Bug Detector is a simple screening tool for USB-A cables and devices: it lights a BUGGED LED when the connected item draws more than about 1.6 mA. That can flag unexpected electronics, including some malicious cables, but it cannot identify a chip or prove intent. Its designer says the detector limits power to reduce risk while testing; that is a design rationale, not a guarantee for every unknown device.
What the CuVoodoo detector checks
CuVoodoo describes its device as identifying “USB type-A cables (or devices) with integrated circuits.” Its target is unexpected active electronics inside a cable or attached USB device. One example is an O.MG Cable, which can conceal a Wi-Fi microcontroller and provide remote command capability. iFixit describes the cable as a covert data-collection and exfiltration device with Wi-Fi hotspot capability.
The CuVoodoo is therefore a screening tool for signs of electronics, not a general-purpose cable-quality tester or a forensic analyzer. Its result is about observed power draw, not what a detected component does.
How its detection works
Insert a CR1220 coin-cell battery, press reset, then connect the suspect cable. As described in Gareth Halfacree’s 2022 Hackster report, current draw above 1.6 mA trips a NOR-gate SR latch and turns on the BUGGED LED. A SIMULATE button lets you check that the detector and battery can trigger the indicator.
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- 【Type-C eMarker Chip Reading】Reads eMarker chip parameters in Type-C cables, providing detailed performance information (e.g., maximum current, voltage, data transfer rates) to help users fully understand cable capabilities and ensure safe, efficient device usage.
- 【High-Definition Color Display】 The USB cable checker features a 2.4-inch high-definition color display. With the left white button, you can easily switch between function pages to view real-time detailed status of the cable, including internal resistance, power delivery efficiency, and cable quality. This helps you quickly identify inferior cables.
- 【Wide Compatibility】The usb tester can accurately identify and verify USB cable versions, including USB 2.0 and USB 3.2. It integrates PD 3.0 and PD 3.1 protocol detection functions, enabling quick verification of whether the cable supports the latest PD 3.0/3.1 standards, ensuring the cable meets high-power charging and fast data transfer requirements.
- 【Multiple Power Supply Options】The black button on the left can flexibly switch the power supply mode, and support the use of AAA battery or Type C 5V to stably supply power to the USB tester
The circuit’s 1 kΩ inline resistor and limited 3.3 V supply cap the current available at the USB plug at 3.3 mA. CuVoodoo creator Kévin presented that limit as a safety measure: it is generally too little to power an integrated circuit properly, especially a radio interface. It should not be treated as a universal guarantee for every unknown cable or device.
Hackster reported that the detector draws 3 mA while the LED is on and 64 nA while it is off. Kévin estimated that a typical 35 mAh CR1220 could provide 62 years of idle battery life. That is an estimate based on idle draw, not a promise of real-world service life; battery condition and use affect results.
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- 【High-Quality Tester】This USB cable tester is specifically designed to tackle cable clutter, enabling quick identification of various USB cable types. By observing the LED indicators on the test board, users can intuitively determine the number of wire cores and transmission performance.
- 【Extensive Compatibility】Equipped with nearly all mainstream USB interfaces—Type-C, USB-A 3.0, Micro-B 3.0, Micro-B 2.0, Mini-B 2.0, and Lightning cables—this USB cable tester can quickly detect cable status (normal/fault/open circuit/charge-only/data transmission function/high-speed data transmission, etc.).
- 【Efficient Detection】When dealing with piles of tangled cables, this USB-C tester allows you to swiftly distinguish between different USB-C cables. It is particularly suitable for electronics repair, device debugging, cable quality inspection, and similar scenarios.
- 【Dual Power Supply Methods】The USB tester offers flexible power options: it can be powered either by a CR2032 button cell battery or via a Type-C interface (Note: When using Type-C for power, a separate 5V power adapter is required).
- 【Compact Size】With its small form factor measuring just 7.3×5.7×1 cm, this USB tester is highly portable and can be carried anywhere. Please note: This device is intended solely for cable testing and must not be connected to end devices such as smartphones or computers.
What a BUGGED light does—and does not—mean
- It means: the test circuit observed enough current draw to cross its threshold, indicating unexpected electronics may be present.
- It does not mean: the detector has identified a particular chip, shown that the cable is malicious, or established what data it can access.
- A dark LED is not a forensic clearance. The available specifications do not establish CuVoodoo’s false-positive or false-negative rate, nor do they show that it can detect every dormant implant.
Use the result as a reason to avoid trusting a suspicious cable, not as proof of either safety or compromise. Do not connect a cable you distrust to a computer or phone merely to investigate it.
CuVoodoo versus commercial O.MG cable detectors
The devices below use different approaches and have different capabilities. Manufacturer and retailer claims describe their products; they are not independent comparative test results.
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- INSTANT USB CABLE TESTER AND ANALYZER - Eliminate the chaos of mixed cables. This device functions as a rapid data line checker, instantly distinguishing between high-speed data transfer wires and charge-only cords. It acts as a crucial filter for your electronics, ensuring you never grab a limited charging cable when you need full data performance.
- PREMIUM PURPLE BOARD WITH PROTECTION - Unlike basic bare PCB tools or fragile acrylic case models, our UCT-01 features a custom violet board mounted on a robust black insulated base. This design protects the electronic circuit from static and physical damage, making it a durable, professional-grade gadget for any tech enthusiast's desktop.
- PRECISE LED PINOUT DISPLAY - Stop guessing with vague indicators. This diagnostic tool uses a clear LED array to display the continuity of VBUS, GND, D+, D-, and CC pins. It effectively identifies open circuits, short circuits, and wire faults, serving as a visual power meter for the internal health of your Type-C and USB-A connections.
- DEDICATED PORT MAPPING & DEVICE SUPPORT - Optimized for the modern home and office. For USB-C to C cables, connect ports C1 & C2. For USB-A to C cables, strictly connect C1 & A2 (C2 & A2 will not function). This precise mapping ensures accurate diagnostics for your phone charger cord, laptop adapter, and power bank cable, removing obsolete connectors.
- PORTABLE REPAIR KIT WITH 3 BATTERIES - Ready for immediate use right out of the box. The kit includes the tester, a pre-installed CR2032 battery, two extra replacement batteries, and a hex screwdriver. A compact, essential addition to your digital multimeter or network tools bag, perfect for electricians and IT maintenance usage.
| Device | Detection method and compatibility | Data blocking | Power, price and availability |
|---|---|---|---|
| CuVoodoo USB Bug Detector v1 | Current-draw threshold; USB-A cables or devices. No published coverage for all dormant implants. | Not stated as a feature. | CR1220 coin cell. Hackster reported assembled units at $8 through CuVoodoo’s Tindie store in 2022; current listing and price may differ. |
| Hak5 O.MG Malicious Cable Detector | Hak5 says it analyzes cable behavior 200,000 times per second and detects all known malicious USB cables. | Hak5 says it can act as a USB data blocker for safe charging. | Not stated in the cited product documentation. |
| Lab401 O.MG detector listing (2023) | USB-A cable compatibility; listed at 200,000 samples per second. | Listed with data-blocking functionality. | Lab401 listed it at €69 when accessed in 2026; stock and price can change. |
The CuVoodoo offers a simpler threshold-based check. Hak5’s detector is marketed specifically for malicious cable analysis and data blocking, with a stated 200,000 analyses per second. Those specifications do not establish that one device catches every real-world implant; choose based on the manufacturer’s stated coverage and your need for a charging-only data blocker.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Don’t confuse it with ordinary USB cable testers
A generic USB cable tester may check wiring, charging, or data-transfer capability, but the category does not imply CuVoodoo’s current threshold or detection of hidden electronics. Confirm the exact tester’s documented function before relying on it for security screening.
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- 【Wide Range of Application】The USB power meter comes with A OTG adapter, supports PD3.0/PD2.0, QC3.0/QC2.0, BC1.2 and USB A or USB C port, supports the updated iPhone 13 Pro mobile phone. (Support iphone 13/12/11/X/iPhone Xs quick charging, 29W power, 5V3A/9V3A/12V2.5A/15V2A). Compatible with new MacBook Pro, MacBook, iMac, iMac Pro, Dell XPS, Acer Aspire, HP Spectre, Lenovo Thinkpad, Eluktronics, Razer Blade Stealth, Chromebook, Microsoft Surface Pro and more Type C devices and chargers.
- 【Test Power Bank Capacity】Before testing the power Bank,please fully charge the power bank,insert the usb voltage tester and double-click to clear the data,then connect the load or mobile phone (continuous discharge is required).ensure that the discharge voltage is 5V or 9V.(mAh is multiplied by 1.35 when discharge voltage 5V, and mAh is multiplied by 2.45 when discharge voltage is 9V, which is equal to the exact capacity of the battery of the power bank.)
- 【Professional Safety Guard】This USB C tester featured with over-voltage protection, over-current protection, under-voltage protection, low energy protection. This upgraded USB Type C tester can detect safety and maximally protect the appliances from damaging. It will cut off output automatically, while it will save data when power off suddenly.
CuVoodoo also makes a separate micro-USB tester that determines whether a USB 2.0 micro-B cable supports data transfer or charging only. That answers a different question; it is not the USB bug detector.
Quick Recap
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- UPGRADED MULTIFUNCTIONAL USB C POWER METER: Detects the charging status and process of your USB-enabled or type c-enabled devices. Supports QC3.0, QC2.0 and BC1.2. A Must Gadget checks the charging performance (charging speed and quality) of the output wall/car/solar panel chargers and USB charging cables. It can be also used to find the highest current of the Wireless Charger, and test capacity and electric energy of power bank
- PROFESSIONAL SAFETY GUARD: Featured with over-voltage protection, over-current protection, under-voltage protection, low energy protection and alarm system. This upgraded USB Type C tester can detect safety and maximally protect the appliances from damaging. It will cut off output automatically and alarm by sound, while it will save data when power off suddenly
- MULTIPLE COLOR SCREEN DISPLAY MODES: New upgraded version offers 8 LCD main color screen display interfaces, allowing switching the display interface by pressing the key. With the new interface settings, this instrument can monitor voltage, current, capacity, electric quantity, power, load impedance, D+/D- voltage and other data of USB
- WIDE RANGE OF APPLICATION: Thanks to the PD protocol quick charging mode measurement technology, this new multimeter supports the updated iPhone X mobile phone. (Support iphone 8 / 8P / iPhone Xs quick charging, 29W power, 5V3A / 9V3A / 12V2.5A / 15V2A). It also can be applied to test other type C devices, Compatible With Galaxy S10/S9/Note 10 +, ChromeBookPixel, OnePlus and More
- QUALITY COMMITMENT: We always believe in the stability and continuous improvement of product quality. Package includes 1 x USB Tester. (Note: If the USB tester does not show any parameters, please insert the small adapter sent with the package into the side hole of the USB tester to trigger the PD charging function)
Sources and product details
- Hackster’s 2022 technical report describes the CuVoodoo circuit, current threshold, power draw, SIMULATE button and then-reported price.
- CuVoodoo’s project entry describes its USB-A cable and device screening purpose.
- iFixit’s O.MG Cable overview describes its covert data collection and Wi-Fi capability.
- Hak5’s product documentation states its analysis rate, detection claim and data-blocking function.
- Lab401’s product listing gives its listed compatibility, sampling rate, data-blocking function and price.
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.
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