1. Introduction
Thank you for choosing the Duex DXMO27F240S 27-inch 240Hz Flat Monitor with Speaker. This manual provides essential information for setting up, operating, and maintaining your new monitor. Please read this manual thoroughly before use to ensure proper functionality and to prevent damage.
The Duex DXMO27F240S is a high-performance 27-inch flat monitor featuring a 240Hz refresh rate and integrated speakers, designed to provide an immersive visual experience for personal computers and notebooks.
2. Important Safety Information
To ensure safe operation and prolong the life of your monitor, please observe the following safety precautions:
- Do not expose the monitor to rain, moisture, or extreme temperatures.
- Avoid placing the monitor in direct sunlight or near heat sources.
- Ensure proper ventilation; do not block ventilation openings.
- Use only the power adapter supplied with the monitor.
- Do not attempt to open the monitor casing. Refer all servicing to qualified personnel.
- Clean the screen with a soft, lint-free cloth. Avoid using harsh chemicals.
- Position the monitor on a stable, level surface to prevent it from falling.
3. Package Contents
Please check the contents of your product box. If any items are missing or damaged, contact your retailer.
- Duex DXMO27F240S Monitor
- Monitor Stand (Base and Neck)
- Power Adapter and Cable
- HDMI Cable
- User Manual (this document)

Image 3.1: The retail packaging for the Duex DXMO27F240S monitor, showing the monitor's model number and brand.
4. Setup Guide
4.1 Assembling the Stand
- Carefully remove the monitor from its packaging, keeping the screen protected.
- Attach the stand neck to the monitor's rear mounting point. Secure with screws if provided.
- Attach the stand base to the stand neck. Secure with the thumb screw or screws provided.
- Place the assembled monitor on a stable, flat surface.
4.2 Connecting the Monitor
Connect the necessary cables to the monitor and your computer.
- Power Connection: Connect the power adapter to the monitor's power input port, then plug the power cable into a wall outlet.
- Video Connection: Connect one end of the HDMI cable (or DisplayPort cable, if preferred and available) to the corresponding port on your computer's graphics card and the other end to an HDMI or DisplayPort input on the monitor.
- Audio (Optional): If you prefer to use external speakers or headphones instead of the integrated speakers, connect them to the monitor's audio output jack (if available) or directly to your computer.

Image 4.1: Rear view of the Duex DXMO27F240S monitor, highlighting the various input ports and ventilation grilles.
5. Operating Instructions
5.1 Powering On/Off
Press the power button, usually located on the bottom or rear of the monitor, to turn the monitor on or off. The power indicator light will illuminate when the monitor is on.
5.2 On-Screen Display (OSD) Menu
The OSD menu allows you to adjust various monitor settings. Access the OSD menu using the buttons located on the monitor (typically on the bottom or rear).
- Navigation: Use the directional buttons to navigate through the menu options.
- Select/Confirm: Press the 'OK' or 'Menu' button to select an option or confirm a setting.
- Exit: Use the 'Exit' or 'Back' button to return to the previous menu or exit the OSD.
Common OSD settings include:
- Picture Settings: Brightness, Contrast, Sharpness, Color Temperature.
- Input Source: Manually select HDMI, DisplayPort, etc.
- Audio Settings: Volume control for integrated speakers.
- Display Settings: Aspect Ratio, Overdrive.
- OSD Settings: OSD Language, OSD Timeout.

Image 5.1: Front view of the Duex DXMO27F240S monitor, showcasing its display with a vibrant background.
6. Maintenance and Care
Proper maintenance ensures the longevity and performance of your monitor.
- Cleaning the Screen: Gently wipe the screen with a soft, dry, lint-free cloth. For stubborn marks, lightly dampen the cloth with water or a specialized screen cleaner (ensure it's alcohol-free) and wipe carefully. Do not spray liquid directly onto the screen.
- Cleaning the Casing: Use a soft, dry cloth to wipe the monitor casing. Avoid abrasive cleaners.
- Storage: If storing the monitor for an extended period, disconnect all cables, pack it in its original packaging (if available), and store it in a cool, dry place.
- Power Off: Always turn off the monitor and unplug it from the power outlet before cleaning or if it will be unused for a long time.
7. Troubleshooting
If you encounter issues with your monitor, refer to the following table for common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cable not connected; Power outlet not working; Monitor power button off. | Ensure power cable is securely connected. Test the power outlet. Press the monitor's power button. |
| No signal | Video cable not connected; Incorrect input source selected; Computer not outputting signal. | Check video cable connections (HDMI/DisplayPort). Select the correct input source via OSD. Restart your computer. |
| Image too dark/bright | Brightness/Contrast settings incorrect. | Adjust Brightness and Contrast settings in the OSD menu. |
| No sound from speakers | Volume too low; Muted; Audio source not selected; Computer audio settings. | Increase volume via OSD. Check if muted. Ensure audio is routed to the monitor in your computer's sound settings. |
| Flickering image | Loose video cable; Incorrect refresh rate; Graphics driver issue. | Secure video cable. Set correct refresh rate (240Hz) in computer display settings. Update graphics drivers. |
If the problem persists after trying these solutions, please contact customer support.
8. Technical Specifications
| Feature | Specification |
|---|---|
| Brand | Duex |
| Model Number | DXMO27F240S |
| Screen Size | 27 Inches |
| Resolution | 1920 x 1080 (FHD 1080p) |
| Refresh Rate | 240 Hz |
| Response Time | 1 Millisecond |
| Color | Black |
| Power Supply | AC/DC |
| Product Dimensions (L x W x H) | 20 x 61 x 41 cm |
| Product Weight | 4.77 Kilograms |
| EAN | 7791838889853 |
9. Warranty and Customer Support
The Duex DXMO27F240S monitor comes with a standard manufacturer's warranty. Please refer to the warranty card included in your package or contact your retailer for specific warranty terms and conditions.
For technical assistance, troubleshooting beyond this manual, or warranty claims, please contact Duex customer support or your authorized dealer. Have your model number (DXMO27F240S) and purchase information ready when contacting support.





