1. Introduction
This manual provides detailed instructions for the Rii RK400 USB Wired 104-Key RGB LED Backlit Gaming Keyboard and Mouse Combo. This combo is designed for PC and laptop use, offering a full-size keyboard layout with multimedia functions and an ergonomic gaming mouse with adjustable DPI.

Image 1.1: Rii RK400 Gaming Keyboard and Mouse Combo
2. Package Contents
Verify that all items are present in the package:
- Rii RK400 USB Wired 104-Key RGB LED Backlit Keyboard
- Rii USB Wired Gaming Mouse
- User Manual

Image 2.1: Rii RK400 Keyboard and Mouse Combo Packaging
3. Setup Instructions
The Rii RK400 keyboard and mouse combo is designed for simple plug-and-play operation. No additional drivers are required for basic functionality.
- Locate an available USB port on your computer (PC or laptop).
- Plug the USB connector of the keyboard into the USB port.
- Plug the USB connector of the mouse into another available USB port.
- The operating system will automatically detect and install the necessary drivers.
- The keyboard and mouse are now ready for use.
4. Operating Instructions
4.1 Keyboard Functions
RGB Backlight Control
The keyboard features RGB backlighting with multiple modes and brightness levels.
- FN + Scroll Lock: Switch between 2 different light modes.
- FN + PgUp / PgDn: Adjust backlight brightness levels.
- Scroll Lock (single press): Turn the backlight ON/OFF.

Image 4.1: Rii RK400 Keyboard RGB Backlight Controls
Multimedia Shortcut Keys
Access various multimedia functions using the FN key in combination with the F1-F12 keys.
- FN + F1: Music
- FN + F2: Volume -
- FN + F3: Volume +
- FN + F4: Mute
- FN + F5: Play/Stop
- FN + F6: Previous Track
- FN + F7: Play/Pause
- FN + F8: Next Track
- FN + F9: Email
- FN + F10: Web Home
- FN + F11: Lock
- FN + F12: Calculator

Image 4.2: Rii RK400 Keyboard Multimedia Function Shortcut Keys
4.2 Mouse Functions
DPI Adjustment
The gaming mouse allows for on-the-fly DPI (Dots Per Inch) adjustment to suit different gaming or work scenarios.
- Press the DPI button located on the top of the mouse to cycle through the available DPI settings.
- Available DPI levels: 1200 / 1600 / 2400 / 3200.

Image 4.3: Rii Gaming Mouse with Adjustable DPI Settings
5. Maintenance
To ensure the longevity and optimal performance of your Rii RK400 keyboard and mouse combo, follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to wipe down the surfaces of the keyboard and mouse. For stubborn dirt, a slightly damp cloth can be used, ensuring no liquid enters the devices.
- Avoid Liquids: Do not expose the keyboard or mouse to excessive moisture or liquids, as this can cause damage.
- Storage: Store the devices in a cool, dry place away from direct sunlight and extreme temperatures when not in use for extended periods.
- Cable Care: Avoid bending or twisting the USB cables excessively to prevent internal wire damage.
6. Troubleshooting
If you encounter issues with your Rii RK400 keyboard and mouse combo, refer to the following common troubleshooting steps:
- Device Not Responding:
- Ensure the USB cables are securely plugged into your computer's USB ports.
- Try plugging the devices into different USB ports on your computer.
- Restart your computer.
- Test the keyboard and mouse on another computer to determine if the issue is with the devices or your computer.
- Backlight Not Working:
- Press the Scroll Lock key to ensure the backlight is not simply turned off.
- Use FN + PgUp to increase brightness.
- Ensure the keyboard is properly connected.
- Keys Not Registering / Sticky Keys:
- Clean around and under the affected keys to remove any debris.
- If the issue persists, it may indicate a hardware malfunction.
- Mouse Cursor Jumps or is Erratic:
- Ensure the mouse sensor is clean and free of dust or debris.
- Use the mouse on a clean, uniform surface (e.g., a mouse pad).
- Adjust the DPI setting using the DPI button on the mouse.
7. Specifications
| Feature | Specification |
|---|---|
| Brand | Rii |
| Model | RK400 |
| Connectivity Technology | USB Wired |
| Keyboard Layout | 104 Keys, Full Size |
| Keyboard Backlight | RGB LED Backlit |
| Mouse DPI Settings | 1200 / 1600 / 2400 / 3200 |
| Compatible Devices | Personal Computer (Windows XP/VISTA/Win 7/Win 8/Win 10/Mac OS) |
| Keyboard Key Life | 5 Million Clicks |
| Mouse Key Life | 3 Million Clicks |
| Package Dimensions | 17.48 x 9.65 x 2.2 inches |
| Item Weight | 1.87 pounds |

Image 7.1: Rii RK400 Keyboard and Mouse Dimensions

Image 7.2: Rii RK400 Keyboard and Mouse Key Life Durability
8. Warranty and Support
Rii products are designed for reliability and performance. For warranty information or technical support, please refer to the contact details provided with your product packaging or visit the official Rii website. Keep your purchase receipt for warranty claims.