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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsFor most laptops, the simplest way to connect two HDMI monitors is to plug both into a compatible dual-output dock, then connect the dock to a laptop port that supports its video technology. Set the displays to Extend in your operating system so each screen has its own desktop. First check your laptop’s exact model and port capabilities: two HDMI sockets on a dock do not guarantee two independent screens.
Check whether your laptop supports two external displays
Before choosing a dock or buying cables, find your laptop’s exact model and check its manufacturer specifications. Confirm the maximum number of external displays, supported resolution and refresh rate, and which ports can carry video. The number of screens your setup can run depends on the laptop and graphics hardware as well as the dock. Apple’s Mac display guidance also notes that supported display count depends on model, resolution and refresh rate.
- USB-C is not a guarantee of video. A USB-C port may support data or charging without supporting video. For a native USB-C dock, check for DisplayPort Alt Mode, USB4 or Thunderbolt support as required. Microsoft explains that the PC port, cable and connected device must support compatible USB-C features in its USB-C troubleshooting guidance.
- Check the dock’s display method. A USB-C MST dock, Thunderbolt dock and DisplayLink dock work differently. The laptop and operating system must support the dock’s method.
- Check the complete video path. The laptop, dock, adapters, cables and monitors must support the resolution and refresh rate you want.
Choose a connection method that fits your laptop
| Connection method | What your setup needs | Important limitation |
|---|---|---|
| USB-C DisplayPort Alt Mode dock with MST | A USB-C port that carries DisplayPort video, graphics hardware with capacity for both displays, and a dock supporting the required monitor modes. | Plugable says macOS does not support multiple independent extended displays from a single MST connection. Check its MST compatibility guidance. |
| Thunderbolt dock | A laptop and dock with compatible Thunderbolt support, plus a laptop display limit that allows two external screens. | Check the specifications for your exact Mac or PC model; a Thunderbolt port alone does not override the laptop’s display limit. |
| DisplayLink dock | A dock that supports your operating system and any required DisplayLink software or drivers. | DisplayLink is a distinct USB graphics method, not a feature of every USB dock. Belkin documents its INC002 dock as supporting up to two external 1080p displays over USB-C; consult its INC002 user guide for that model’s details. |
| Separate video connections | Two suitable video outputs on the laptop, or one direct connection and one compatible dock or adapter output. | The laptop’s total display limit still applies. |
If you need to buy a dock, look for a dual HDMI USB-C dock only after confirming it matches your laptop’s port, operating system and display limit. A dock’s two HDMI outputs describe its connectors, not a guarantee that every laptop can drive two independent screens through it.
Connect both HDMI monitors and extend the desktop
- Match the ports. Check that the laptop supports the dock’s video method and that each monitor has an HDMI input. If a connector does not match, choose a compatible video adapter or cable based on supported video features—not connector shape alone.
- Connect the screens. Plug each monitor’s HDMI cable into a separate HDMI output on the dock. Connect the dock to the laptop’s appropriate USB-C or Thunderbolt port. Connect monitor and dock power if required.
- Choose Extend in Windows. Open Settings > System > Display, select the multiple-display option, then choose Extend these displays. Drag the display tiles to match the monitors’ physical positions. DisplayLink’s Windows configuration instructions cover extending and arranging DisplayLink screens.
- Arrange displays on a Mac. Open System Settings > Displays to arrange screens and set resolution or refresh rate. Follow Apple’s Mac display instructions for your model.
- Confirm they are independent. Move a window from one screen to the other. If both screens show the same image, check for mirror or duplicate mode; if the operating system is already set to extend, the laptop and dock may not support two independent displays together.
Mac-specific display limits
Do not assume an MST dock will extend two independent screens from a Mac: Plugable states that macOS does not support multiple independent extended displays from a single MST connection. Check the display limit for your exact Mac model before selecting a Thunderbolt dock, separate display connections or DisplayLink dock.
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- Powerful 7-in-1 Hub: Designed for the multitasker, this 7-in-1 USB-C hub features everything from ultra-fast data transfer to high-definition video output.(No Ethernet port is included.)
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Apple’s dual-display instructions for MacBook Air and MacBook Pro with M3 chips describe a specific setup: MacBook Air requires macOS Sonoma 14.3 or later, and MacBook Pro requires macOS Sonoma 14.6 or later. The setup also requires an external keyboard and mouse or trackpad, and power; the two displays are connected with the laptop lid closed. Opening the lid can make the secondary display go dark or disconnect. These instructions are specific to that M3 setup, not a general rule for all Macs. See Apple’s M3 dual-monitor instructions.
Troubleshoot a two-monitor connection
Neither monitor shows a picture
- Check that the laptop port supports the dock’s video method. Try the port identified in the laptop specifications for DisplayPort Alt Mode or Thunderbolt.
- Check that the dock, cable and any adapter support the required feature and video mode.
- Confirm that the dock and monitors have power. Microsoft lists incompatible PC, cable or port capabilities among causes of USB-C display problems in its USB-C troubleshooting guidance.
Only one monitor works
Check the laptop’s maximum external-display count and the dock’s display technology. An MST hub cannot increase the graphics hardware’s display limit. On a Mac using one MST connection, two screens may not extend independently.
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Both monitors show the same image
Change the system’s display mode from duplicate or mirror to extend. If it is already set to extend, verify that the dock and laptop support two independent displays together.
A monitor daisy-chain does not work
HDMI does not daisy-chain monitors. Connect each HDMI display to a separate video output. Supported chains can use DisplayPort MST, USB-C with DisplayPort Alt Mode or Thunderbolt, but require compatible displays and host support; see Dell’s monitor daisy-chain guidance.
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- Dual HDMI Display: Stream or mirror content to a single device in stunning 4K@60Hz, or hook up two displays to both HDMI ports in 4K@30Hz. Note: For macOS, the display on both external monitors will be identical.
- Power Delivery Compatible: Compatible with USB-C Power Delivery to provide high-speed pass-through charging up to 85W. Please note: 100W PD wall charger and USB-C to C cable required.
- Compatibility: Supports USB-C, USB4, and Thunderbolt connections. Compatible with Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
Resolution or refresh rate is lower than expected
Check the specifications for the laptop, dock, adapter, cable and monitor as a group. The supported mode may depend on the laptop’s display capacity and how many screens are connected; Apple notes that simultaneous display support can depend on resolution and refresh rate in its Mac display guidance.
Quick Recap
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- 【Does not support MST on Mac OS 】This KOZYC USB-C adapter features 2x HDMI port, 1x USB 3.0 port, and 1x100W PD charging port, Note: Android system only supports AAA mode(mirror mode); macOS supports AAA, and ABB mode (does not support MST ABC mode); Windows OS supports AAA, ABB, ABA, and ABC mode.
- 【4k Resolution】This USB C to HDMI Adapter resolution is up to 4K@30Hz. with backward compatible with 60Hz for resolutions of 2K/1080P. Please note: If you want to get a 4k resolution, please make sure your device supports 4k and uses a HDMI cable 2.0 or better
- 【Plug and Play】No external power supply is required for this USB C to HDMI Adapter, just plug and play, and no need for any driver. Note: NOT for all USB-C port laptops, Make sure your laptop or PC supports ” Thunderbolt 3” or “displayport output mode（DP ALT mode）
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- USB-C to Dual HDMI Adapter Hub 2 in 1: Note: For Mac OS, this adapter only supports mirror mode (repeated display), dual screen extension with two different screens is not available on macOS! Connect device with USB Type C (tunderbolt 3) port to two external monitors with 4K HDMI output; You can enjoy movies,games with your families on external ultra HD big screen; Windows OS supports both SST and MST mode, if you not sure how to setting, please contact us, or download the user guide in Product information->Product information
- Wide Compatibility: (Note: Compatible exclusively with Thunderbolt 3/4/5 ports, full-featured USB-C ports, or USB4 ports.Such as it will NOT work with HP Pavilion or Lenovo IdeaPad series. ).This HDMI Reader works well with Thunderbolt 3 compatible devices,such as MacBook/MacBook Pro2021 2020 2019 2018 2017,MacBook Air2020-2018,iPad Pro 2018 ,Dell XPS13/15,Samsung Galaxy S9/S9+,etc
- Vivid 3D Effect Video Sync: This usb c to hdmi adapter resolution up to 4K(3840X2160P@60HZ), dual monitor with HDMI at 3840x2160@30Hz; Dual monitor HDMI adapter also support 1440p and 1080p at 60Hz offered by the DisplayPort MST technology; with this high-performance USB-C adapter when you play games the screen without any millisecond delay. (Important: ONLY when your devices support 4K resolution, the video output will be 4K,please make sure to use a HDMI 2.0 cable or better.)
- Hassle-Free Setup: Multi-stream transport offers an easy setup by natively working on device that supports DP Alt Mode over USB Type-C; SELORE dual hdmi monitor adapter just plug-and-play, no drivers or software required. (NOTED:Please connect the monitor (HDMI port) first, then the laptop (usb c port), You may need to change the settings of "the default audio output device" on system preferences to deliver sound.)
- What you get a: 1* USB Type C Adapter, 1* User Manual, At SELORE we offer 1-year defective product refund/replacement and friendly customer service; If there is any problem with this Dual HDMI Converter (such as: how to setting, how to use it...), please don't hesitate to let me know. I will always do my best to help on it.Note: Only compatible with Thunderbolt 3/4/5 ports, full-featured USB-C ports or USB4 ports, and requires a standard HDMI cable.
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