1. Introduction
This manual provides essential instructions for the setup, operation, and maintenance of your KOORUI BK104 2.4G Wireless Keyboard and Mouse Combo. Please read this manual thoroughly before use to ensure optimal performance and longevity of your device.
2. Package Contents
- KOORUI Wireless Keyboard
- KOORUI Wireless Mouse
- USB 2.4G Receiver
- User Manual
Note: AAA battery for keyboard and AA battery for mouse are not included.
3. Setup Guide
- Locate the USB Receiver: The 2.4G USB receiver is conveniently stored in the battery compartment on the underside of the mouse. Slide open the mouse's back cover to access it.
- Install Batteries:
- For the keyboard: Insert one (1) AAA battery into the keyboard's battery compartment, ensuring correct polarity.
- For the mouse: Insert one (1) AA battery into the mouse's battery compartment, ensuring correct polarity.
- Power On Devices: Turn on the power switches for both the keyboard and the mouse. The power switch for the keyboard is located on the top right edge, and for the mouse, it is on the underside.
- Connect the Receiver: Plug the USB 2.4G receiver into an available USB port on your computer (Laptop, PC, Gaming Console).
- Automatic Connection: The keyboard and mouse should automatically connect to your computer. No additional drivers or software are typically required for Windows, macOS, or Linux systems.


4. Operating Instructions
4.1 General Use
The KOORUI BK104 combo provides a reliable 2.4 GHz wireless connection up to 10 meters (33 feet). The full-size keyboard features a standard US layout with a numeric keypad, offering a comfortable and efficient typing experience. The keys are designed for quiet operation, minimizing typing noise.

4.2 Ergonomic Design
The keyboard is designed with an 8-degree tilt angle, which can be adjusted using the foldable feet on the underside, promoting a more natural and comfortable typing posture. The mouse features an ergonomic shape that fits comfortably in hand for extended use.

4.3 Multimedia and Shortcut Keys (Windows System Only)
The keyboard includes 5 multimedia keys and 12 shortcut functions to enhance productivity and control media playback. These functions are accessed by pressing the Fn key in combination with the corresponding F-keys (F1-F12) or dedicated multimedia keys.
| Key Combination | Function |
|---|---|
| Fn + F1 | Audio Activate |
| Fn + F2 | Volume Down |
| Fn + F3 | Volume Up |
| Fn + F4 | Mute |
| Fn + F5 | Previous Track |
| Fn + F6 | Next Track |
| Fn + F7 | Play/Pause |
| Fn + F8 | Stop |
| Fn + F9 | Start Page (Web Browser Home) |
| Fn + F10 | |
| Fn + F11 | My Computer |
| Fn + F12 | Favorites |
| Dedicated Key | Calculator |
| Dedicated Key | Web Search |
| Dedicated Key | Refresh |
| Dedicated Key | Dormancy (Sleep Mode) |
| Dedicated Key | Switch (Application Switcher) |

4.4 Automatic Power Saving
Both the keyboard and mouse are equipped with an auto-sleep mode function to conserve battery life. After a period of inactivity, the devices will enter sleep mode. To resume use, simply press any key on the keyboard or double-click any button on the mouse.

4.5 Mouse DPI Adjustment
The mouse offers adjustable DPI (Dots Per Inch) settings to control cursor sensitivity. You can cycle through 800, 1200, and 1600 DPI settings by pressing the DPI button located on the top of the mouse, behind the scroll wheel. This allows you to customize the mouse's responsiveness to your preference.
5. Maintenance
- Cleaning: The keyboard features a waterproof design, offering protection against accidental spills. For general cleaning, use a soft, damp cloth. The flat key design makes it easy to clean between keys. Avoid using harsh chemicals or abrasive materials.
- Battery Replacement: Replace batteries when performance degrades. Use one AAA battery for the keyboard and one AA battery for the mouse. Ensure correct polarity during installation.
- Storage: When not in use for extended periods, turn off both the keyboard and mouse to conserve battery life. Store the USB receiver inside the mouse's battery compartment to prevent loss.
6. Troubleshooting
- Device Not Responding:
- Ensure both the keyboard and mouse are powered on.
- Check battery levels and replace if necessary.
- Ensure the USB receiver is securely plugged into a working USB port on your computer. Try a different USB port.
- Move the keyboard and mouse closer to the USB receiver to rule out range issues.
- Restart your computer.
- Lagging or Intermittent Connection:
- Ensure there are no large metallic objects or other wireless devices (e.g., Wi-Fi routers, cordless phones) interfering with the 2.4G signal.
- Move the USB receiver to a different USB port, preferably one closer to the devices or on the front of your computer.
- Keyboard Keys Not Working:
- Check if the keyboard is powered on and has sufficient battery.
- If only specific keys are not working, gently clean around the keys to remove any debris.
- Mouse Cursor Jumps or is Inaccurate:
- Clean the optical sensor on the underside of the mouse.
- Ensure you are using the mouse on a suitable surface (e.g., a mouse pad).
- Adjust the DPI setting using the DPI button on the mouse.
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | BK104 |
| Brand | KOORUI |
| Color | Black |
| Connectivity Technology | 2.4 GHz Radio Frequency (USB Receiver) |
| Wireless Range | Up to 10 meters (33 feet) |
| Keyboard Dimensions (L x W x H) | 17.32 x 5.91 x 0.98 inches (44 x 15 x 2.5 cm) |
| Item Weight | 1.59 pounds (0.72 kg) |
| Keyboard Battery | 1 x AAA battery (not included) |
| Mouse Battery | 1 x AA battery (not included) |
| Mouse DPI Settings | 800 / 1200 / 1600 DPI |
| Special Features | Waterproof design, Ergonomic 8-degree tilt, Wrist Rest, Silent keys, Auto power saving |
| Compatible Devices | Laptop, Personal Computer, Gaming Console (Windows, macOS, Linux) |
8. Warranty and Support
KOORUI provides a 3-Year Limited Warranty for this product. For technical assistance or warranty claims, please contact KOORUI customer support. Our support team is available to assist you with any issues or questions you may have regarding your wireless keyboard and mouse combo.
For further assistance, please refer to the contact information provided with your product packaging or visit the official KOORUI website.