1. Product Overview
The Cable Matters USB-C to Dual HDMI Adapter is designed to expand the display capabilities of your USB-C or Thunderbolt 4 enabled device. This compact and foldable adapter allows you to connect one 8K monitor or two 4K monitors, enhancing your productivity and visual experience. It supports advanced video features like HDR and Dolby Vision for vivid colors, and Dolby Atmos for immersive audio.

A compact black adapter with a short USB-C cable, featuring two HDMI ports for connecting external displays.

The adapter showcasing its foldable USB-C cable, designed for compact storage and portability.
2. Setup Instructions
Follow these steps to connect your USB-C to Dual HDMI Adapter:
- Connect the Adapter to Your Device: Plug the USB-C connector of the adapter into an available USB-C or Thunderbolt 4 port on your laptop, tablet, or smartphone.
- Connect HDMI Cables: Connect your HDMI display cables from your monitors to the HDMI ports on the adapter. Ensure a secure connection for both displays.
- Power On Displays: Turn on your external monitors. Your device should automatically detect the connected displays.
- Configure Display Settings: Adjust your display settings within your operating system (Windows, macOS, Linux) to extend or mirror your desktop as desired.

Illustration of the adapter connected to a laptop via its USB-C port, extending the display to two external monitors via HDMI cables.
3. Operating Instructions
The adapter supports various display configurations depending on your operating system:
- Windows/Linux: Supports dual extended displays, allowing you to have two separate external monitors displaying different content from your primary screen.
- macOS: Supports one extended display. If two monitors are connected, the second monitor will mirror the first extended display.
To configure your displays:
- Windows: Right-click on your desktop, select 'Display settings', and arrange your displays.
- macOS: Go to 'System Settings' > 'Displays' to arrange or mirror your screens.

A visual guide illustrating how the adapter supports two distinct extended displays for Windows and Linux systems, while macOS supports one extended display (mirroring the second if connected).

A table detailing the maximum supported video resolutions and the number of displays for Windows (with DP1.2 and DP1.4) and macOS, including 8K@30Hz, 4K@120Hz, and dual 4K@60Hz.
4. Compatibility
This adapter is universally compatible with USB-C devices that support DisplayPort Alternate Mode (Alt Mode) or Thunderbolt 3/4. It is designed for plug-and-play functionality with a wide range of computers, laptops, and tablets.
- Compatible Devices: Laptops, Desktops, Phones, Tablets with USB-C or Thunderbolt 3/4 ports.
- Compatible Displays: Monitors, UHD TVs, Projectors with HDMI input.
- Operating Systems: Windows, macOS, Linux.

An infographic demonstrating the adapter's broad compatibility with USB-C devices such as laptops, desktops, phones, and tablets, connecting to monitors, UHD TVs, and projectors.
5. Specifications
| Feature | Detail |
|---|---|
| Model Number | 201371-BLK |
| Connector Type | HDMI, USB Type C |
| Number of Ports | 2 (HDMI) |
| Max Resolution (Single Display) | 8K@30Hz or 4K@120Hz |
| Max Resolution (Dual Display) | Dual 4K@60Hz |
| Bandwidth | 48 Gbps |
| Audio Support | 1536 KHz + eARC, Dolby Atmos |
| Color Depth Support | HDR, Dolby Vision |
| HDCP Support | HDCP 2.2 |
| Item Weight | 0.04 Kilograms |
| Color | Black |
6. Maintenance
To ensure the longevity and optimal performance of your adapter, please follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the adapter. Avoid using liquid cleaners or aerosols.
- Storage: When not in use, store the adapter in a cool, dry place away from direct sunlight and extreme temperatures. Utilize its foldable design for compact and safe storage.
- Handling: Avoid bending or twisting the USB-C cable excessively. Do not apply excessive force when plugging or unplugging the adapter or HDMI cables.
7. Troubleshooting
If you encounter issues with your adapter, refer to the following common solutions:
- No Display/Flickering Screen:
- Ensure all cables (USB-C and HDMI) are securely connected.
- Verify that your device's USB-C port supports DisplayPort Alt Mode or is a Thunderbolt 3/4 port.
- Try connecting a single monitor first to isolate the issue.
- Update your graphics drivers on your computer.
- Incorrect Resolution/Refresh Rate:
- Check your operating system's display settings to ensure the correct resolution and refresh rate are selected for each monitor.
- Confirm that your monitors and HDMI cables support the desired resolution and refresh rate.
- macOS Dual Display Behavior:
- On macOS, the adapter supports one extended display. If two monitors are connected, the second monitor will mirror the first extended display. This is a limitation of macOS, not the adapter.
- Audio Issues:
- Ensure your computer's audio output is set to the connected HDMI display in your sound settings.
8. Warranty Information
This Cable Matters product comes with an Extended Warranty. For specific terms and conditions, please refer to the warranty documentation included with your purchase or visit the official Cable Matters website. A 30-day return/replacement policy is typically offered for this product.
9. Support
For further assistance, technical support, or to view frequently asked questions, please visit the official Cable Matters website or contact their customer service department.
Website: www.cablematters.com