What Is the SX-2C4K?
The OREI SplitXtend SX-2C4K is a 4K USB 3.0 to Dual HDMI Display Adapter designed to add two HDMI displays to a compatible Windows or macOS computer.
It connects to the host computer using a built-in 2-in-1 USB-A and USB-C cable. The adapter then provides two HDMI outputs for connecting external monitors, TVs, or displays.
The SX-2C4K supports video resolutions up to 4K@60Hz on each HDMI output. It can be used for mirror mode or extended desktop mode, making it useful for multitasking, office work, web browsing, spreadsheets, presentations, and general productivity.
The adapter requires driver installation before use. It is compatible with Windows 7 / 8 / 8.1 / 10 and above, and macOS 10.10.x and above. The manual notes that the adapter is ideal for general productivity and is not recommended for gaming, graphics-intensive work, or design work.
IMPORTANT — Driver Installation Is Required
The SX-2C4K requires driver installation before the HDMI outputs will work.
| Requirement | Details |
| Driver required | Yes |
| Driver type | DisplayLink / Silicon Motion style USB graphics driver |
| Windows driver installation | Required |
| macOS driver installation | Required |
| Plug-and-play without driver | Not supported |
The manual specifically notes: Driver installation required and Silicon Motion Drivers Required.
If the displays do not work after connecting the adapter, install the required driver first and restart the computer if prompted.
IMPORTANT — USB 3.0 Data Support Is Required
The host computer’s USB-C or USB-A port must support USB 3.0 data transmission.
| Host Port | Requirement |
| USB-C | Must support USB 3.0 data |
| USB-A | Must support USB 3.0 data |
| Thunderbolt 3 / 4 | Supported |
| USB 3.1 Gen 1 | Supported |
| USB 2.0 | Not recommended / insufficient |
The manual states that the USB-C / USB-A equipped device must support USB 3.0 data transmission.
If the adapter is connected to a USB 2.0 port, video may not output correctly.
IMPORTANT — This Is Not a Native USB-C Alt Mode Adapter
The SX-2C4K uses USB graphics driver technology.
| Feature | Support |
| USB graphics display output | Supported |
| Driver-based display output | Supported |
| USB-C Alt Mode requirement | Not required |
| DisplayLink / Silicon Motion-style driver | Required |
| Direct GPU video output | Not the main function |
This is important because the adapter can work with compatible USB-A and USB-C ports that support USB 3.0 data, even if the USB-C port is not a native video-output Alt Mode port.
IMPORTANT — Supports Two HDMI Outputs
The SX-2C4K includes two HDMI outputs.
| Output | Function |
| HDMI OUT 1 | Connect external display 1 |
| HDMI OUT 2 | Connect external display 2 |
Both HDMI outputs support up to 4K@60Hz resolution when the computer, driver, cable, and display support the selected resolution.
IMPORTANT — Mirror and Extend Modes Are Supported
The SX-2C4K supports both mirrored and extended display operation.
| Display Mode | Function |
| Mirror Mode | Shows the same screen on connected displays |
| Extend Mode | Adds extra desktop space across displays |
Use Extend Mode when you want to use two additional monitors for multitasking.
Use Mirror Mode when you want the same content shown on multiple displays.
IMPORTANT — Supports up to 8 Displays on Windows with Multiple Units
The manual states that Windows can support up to 8 displays when using multiple units of this adapter.
| Feature | Support |
| Multiple adapters on Windows | Supported |
| Up to 8 displays on Windows | Supported |
| Multiple-adapter setup on macOS | Not listed |
Actual performance depends on the computer CPU, RAM, USB bandwidth, driver support, and total display resolution.
IMPORTANT — Not Recommended for Gaming or Graphics-Intensive Work
The SX-2C4K is designed for general productivity.
| Use Case | Recommendation |
| Web browsing | Recommended |
| Office work | Recommended |
| Spreadsheets | Recommended |
| Presentations | Recommended |
| General multitasking | Recommended |
| Gaming | Not recommended |
| Graphics-intensive work | Not recommended |
| Design work | Not recommended |
Because the adapter uses USB display technology and requires drivers, it is best used for productivity displays rather than high-frame-rate gaming or professional design workflows.
IMPORTANT — HDR Is Not Supported
The SX-2C4K supports 4K@60Hz video output, but HDR is not supported.
| Feature | Support |
| 4K@60Hz | Supported |
| HDR | Not supported |
| LPCM audio | Supported |
| 8 / 10 / 12-bit color depth | Supported |
If a display or source expects HDR, disable HDR in the operating system display settings for best compatibility.
IMPORTANT — macOS Screen Recording Permission May Be Required
During macOS driver setup, the system may ask to enable Screen Recording permission.
The manual explains that the device does not record or store the screen. macOS uses this permission name to allow the driver to extend or duplicate displays.
| macOS Permission | Purpose |
| Screen Recording | Required by the display driver for extending or duplicating displays |
| Actual screen recording by adapter | No |
If external displays do not work on macOS after installing the driver, check macOS Privacy & Security settings and allow the display driver permission.
Ports and Panel Layout
| Port / Connector | Function |
| USB-C connector | Connect to a USB-C port on a laptop that supports USB 3.0 |
| USB-A connector | Connect to a USB-A port on a laptop that supports USB 3.0 |
| HDMI output 1 | Connect display device such as TV, monitor, or projector |
| HDMI output 2 | Connect second display device such as TV, monitor, or projector |
The adapter uses a built-in 2-in-1 USB-A / USB-C cable for flexible connection to different host computers.
Step-by-Step Setup
- Confirm the computer supports USB 3.0 data over the USB-A or USB-C port.
- Download and install the required display driver for the operating system.
- Restart the computer if the driver installer asks for a restart.
- Connect the SX-2C4K to the computer using the built-in USB-A or USB-C connector.
- Connect HDMI display 1 to the first HDMI output.
- Connect HDMI display 2 to the second HDMI output.
- Power on the displays.
- Open the computer display settings.
- Select Mirror or Extend display mode.
- Set the desired resolution for each display.
- Arrange the displays in the operating system based on their physical position.
- Test video output, display arrangement, audio output, and resolution settings.
Windows Driver Installation
- Download the driver for the operating system.
- Unzip the driver file.
- Double-click the .exe file.
- If the User Account Control prompt appears, click Yes.
- If a security prompt appears, click Install or Run Anyway.
- When the driver installation wizard opens, click Install.
- After installation is complete, click Finish.
- Restart the computer if prompted.
- Connect the SX-2C4K and configure the display settings.
macOS Driver Installation
- Download the macOS driver.
- Open the .dmg file.
- Click the DisplayLink Software Installer package.
- Click Continue through the installer prompts.
- Complete the installation.
- If macOS asks for Screen Recording permission, open system settings and allow the display driver.
- Restart the computer if required.
- Connect the SX-2C4K and configure the display settings.
Windows Display Mode Setup
- Right-click anywhere on the desktop.
- Click Display settings.
- Select each display window to adjust resolution and settings.
- Arrange the display boxes based on the physical monitor placement.
- Use the multiple display dropdown to select a mode.
- Select Extend to this display to extend the desktop.
- Select duplicate options if you want mirrored displays.
- Click Apply to save changes.
macOS Display Mode Setup
- Click the Apple icon.
- Open System Preferences or System Settings.
- Click Displays.
- Select each connected display.
- Set the desired resolution.
- Choose mirror or extend mode.
- Arrange the displays based on their actual placement.
Important macOS notes:
- macOS devices do not support rotation mode through this adapter.
- M1 / M2 Macs support clamshell mode.
- USB-C or USB-A device port must support USB 3.0 data transmission.
Supported Windows Resolutions
| Supported Resolution |
| 4096x2160@60Hz |
| 3840x2160@60Hz |
| 2048x1152@60Hz |
| 1920x1440@60Hz |
| 1920x1080@60Hz |
| 1280x1024@60Hz |
| 1280x800@60Hz |
| 1280x720@60Hz |
| 1024x768@60Hz |
| 800x600@60Hz |
Supported macOS Resolutions
| Supported Resolution |
| 4096x2160@60Hz |
| 3840x2160@60Hz |
| 3008x1692@60Hz |
| 2720x1536@60Hz |
| 2560x2048@60Hz |
| 2560x1440@60Hz |
| 2304x1728@60Hz |
| 2048x1536@60Hz |
| 2048x1152@60Hz |
| 2048x1080@60Hz |
| 1920x1440@60Hz |
| 1920x1080@60Hz |
| 1600x1200@60Hz |
| 1600x900@60Hz |
| 1504x846@60Hz |
| 1360x768@60Hz |
| 1344x1008@60Hz |
| 1344x756@60Hz |
| 1280x1024@60Hz |
| 1280x960@60Hz |
| 1280x720@60Hz |
| 1152x864@60Hz |
| 1024x768@60Hz |
| 960x540@60Hz |
| 800x600@60Hz |
USB Requirement — Critical
The SX-2C4K requires a USB port that supports USB 3.0 data.
| USB Requirement | Details |
| USB standard | USB 3.0 compliant |
| Host connector | USB-A or USB-C |
| Required host support | USB 3.0 data transmission |
| Thunderbolt 3 / 4 | Compatible |
| USB 3.1 Gen 1 | Compatible |
If there is no video output:
- Confirm the USB port supports USB 3.0.
- Try another USB-A or USB-C port on the computer.
- Avoid USB hubs during troubleshooting.
- Install or reinstall the required driver.
- Restart the computer after driver installation.
HDMI Cable Requirement — Critical
Use high-quality HDMI cables for 4K@60Hz output.
| HDMI Requirement | Specification |
| HDMI output | 2 x HDMI Type-A |
| Maximum resolution | 4K@60Hz |
| Recommended cable | 4K-capable HDMI cable |
Poor HDMI cables may cause:
- No video
- Flickering
- Black screen
- Wrong resolution
- Display not detected
- 4K@60Hz not available
- Audio not passing to display
For troubleshooting, test each HDMI cable directly with another working HDMI source if possible.
Driver Requirement — Critical
The adapter will not work correctly unless the driver is installed.
| Driver Issue | What to Check |
| No display detected | Install the correct driver |
| Display detected but no output | Restart after installation |
| macOS display not working | Allow Screen Recording permission |
| Windows security warning | Click Install or Run Anyway |
| Display unstable | Reinstall or update the driver |
Always install the driver before troubleshooting hardware failure.
Audio Requirement — Critical
The SX-2C4K supports LPCM audio over HDMI.
| Audio Feature | Support |
| HDMI audio | Supported |
| Audio format | LPCM |
| Analog audio output | Not supported |
| Optical audio output | Not supported |
If there is no audio:
- Open the computer sound settings.
- Select the HDMI display or adapter as the audio output.
- Confirm the display supports audio.
- Check the display volume.
- Try another HDMI cable.
- Restart the computer after driver installation.
For most laptops, the audio output device must be changed manually in the operating system.
Power Requirement
The SX-2C4K is powered through USB.
| Power Feature | Details |
| External power adapter | Not required |
| Power source | USB host connection |
| Power consumption | 5W |
If the adapter does not power or detect correctly, try another USB 3.0 port on the computer.
Understanding the Application Example
The application example shows a laptop connected to the SX-2C4K through USB, with two HDMI displays connected to the adapter. It shows both Mirror Mode and Extend Mode.
This illustrates the main use case: one laptop can add two external HDMI displays for duplicated screens or extended desktop workspace.
Supported Technical Specifications
| Specification | Support |
| Product Type | SplitXtend 4K USB 3.0 to HDMI Display Adapter |
| Model | SX-2C4K |
| USB Compliance | USB 3.0 |
| HDMI Compliance | HDMI 2.0 |
| Video Bandwidth | 6Gbps per channel / 18Gbps all channels |
| Maximum Resolution | 4K@60Hz |
| Color Space | 4:4:4 / 4:2:0 |
| Color Depth | 8 / 10 / 12-bit |
| Audio Format | LPCM |
| HDR | Not supported |
| Input | 1 x USB Type-A / Type-C male |
| Outputs | 2 x HDMI Type-A, 19-pin female |
| Housing | ABS plastic |
| Color | Black |
| Dimensions | 100mm x 52mm x 13.5mm / 3.94in x 2.05in x 0.53in |
| Weight | 78g / 2.75oz |
| Power Consumption | 5W |
| Certifications | FCC, CE, RoHS |
| Operating Temperature | 0°C to 60°C / 32°F to 140°F |
| Storage Temperature | -10°C to 70°C |
| Relative Humidity | 5% to 90% RH, non-condensing |
| ESD Protection | Contact discharge ±4kV, air discharge ±8kV, IEC61000-4-2 |
Package Contents
| Item | Quantity |
| SX-2C4K | 1 |
| User Manual | 1 |
What Computers Is the SX-2C4K Compatible With?
The SX-2C4K is compatible with computers that support USB 3.0 data transmission and the required driver.
Compatible computer types include:
- Windows laptops
- Windows desktop PCs
- macOS laptops
- macOS desktop computers
- USB-A computers with USB 3.0
- USB-C computers with USB 3.0 data
- Thunderbolt 3 / 4 computers
Minimum system requirements listed in the manual:
| Requirement | Specification |
| Windows OS | Windows 7 / 8 / 8.1 / 10 and above |
| macOS | Mac OS 10.10.x and above |
| CPU | Core i5 and above |
| RAM | 4GB and above |
What Displays Is the SX-2C4K Compatible With?
The SX-2C4K can connect to HDMI displays such as:
- 4K monitors
- 4K TVs
- 1080p monitors
- 1080p TVs
- HDMI projectors
- Office monitors
- Conference room displays
- Commercial displays
Each display connects to one HDMI output on the adapter.
Frequently Asked Questions
Q: What is the SX-2C4K used for?
A: It is used to add two HDMI displays to a compatible USB-A or USB-C computer using USB 3.0 display adapter technology.
Q: Is the SX-2C4K a USB to HDMI display adapter?
A: Yes. It is a USB 3.0 to dual HDMI display adapter.
Q: How many HDMI outputs does it have?
A: It has two HDMI outputs.
Q: Does it support 4K@60Hz?
A: Yes. It supports up to 4K@60Hz on the HDMI outputs.
Q: Does each output support 4K@60Hz?
A: Yes, the manual states that it provides video resolutions up to 4K@60Hz on each output.
Q: Does it support HDR?
A: No. HDR is not supported.
Q: What HDMI version does it support?
A: It supports HDMI 2.0.
Q: What USB version is required?
A: USB 3.0 data support is required.
Q: Can I connect it to USB-C?
A: Yes. It has a USB-C connector.
Q: Can I connect it to USB-A?
A: Yes. It has a USB-A connector.
Q: Does it work with Thunderbolt 3 or Thunderbolt 4?
A: Yes. The manual lists Thunderbolt 3 / 4 compatibility.
Q: Does it work with USB 3.1 Gen 1?
A: Yes. USB 3.1 Gen 1 compatibility is listed.
Q: Does it require a driver?
A: Yes. Driver installation is required before use.
Q: Will it work without installing the driver?
A: No. The manual notes that driver installation is required.
Q: What driver should I install?
A: Install the required display driver for your operating system from the driver download link listed in the manual.
Q: Does it work with Windows?
A: Yes. The manual lists Windows 7 / 8 / 8.1 / 10 and above.
Q: Does it work with macOS?
A: Yes. The manual lists macOS 10.10.x and above.
Q: Does macOS need Screen Recording permission?
A: Yes. macOS may ask for Screen Recording permission for the display driver. The manual notes that this does not mean the adapter records or stores your screen.
Q: Does it support mirror mode?
A: Yes. Mirror mode is supported.
Q: Does it support extended desktop mode?
A: Yes. Extend mode is supported.
Q: Can I use it for gaming?
A: It is not recommended for gaming.
Q: Can I use it for graphics-intensive or design work?
A: It is not recommended for graphics-intensive or design work.
Q: What is it best used for?
A: It is best used for general productivity, web browsing, office work, spreadsheets, and multitasking.
Q: Can I connect multiple SX-2C4K adapters?
A: On Windows, the manual states that up to 8 displays can be connected using multiple units of this adapter.
Q: Does it support audio?
A: Yes. It supports LPCM audio through HDMI.
Q: What should I do if there is no video output?
A: Lower the laptop resolution, try different HDMI cables, confirm the USB-C or USB-A port is at least USB 3.0, install the driver, and restart the computer.
Q: What should I do if there is no audio output?
A: Select the adapter or connected HDMI display as the audio output in the computer sound settings.
Q: Why is my display not detected after connecting the adapter?
A: The driver may not be installed, the USB port may not support USB 3.0 data, or the HDMI cable/display may not support the selected resolution.
Q: Why is 4K@60Hz not available?
A: Confirm the display supports 4K@60Hz, use a 4K-capable HDMI cable, install the driver, and check the operating system display settings.
Q: Does it require external power?
A: No external power adapter is listed. The adapter is powered through USB and consumes up to 5W.
Q: What are the dimensions of the SX-2C4K?
A: 100mm x 52mm x 13.5mm / 3.94in x 2.05in x 0.53in.
Q: What is included in the package?
A: The package includes the SX-2C4K adapter and one user manual.
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