1. Introduction
Thank you for choosing the HUO JI E-Element E780 2.4GHz Ultra-Slim Wireless Keyboard and Mouse Combo. This combo is designed to provide a comfortable and efficient wireless experience for your computer. It features an ergonomic keyboard with flat keys and a contoured mouse with adjustable DPI settings and an LED backlight. This manual will guide you through the setup, operation, and maintenance of your new wireless peripheral set.
Compatibility: This combo is compatible with Windows 2000/XP/7/8/10/Vista, Mac OS X, and Linux operating systems.
2. Package Contents
- 1x Wireless Keyboard
- 1x Wireless Mouse
- 1x Nano Receiver
Note: Batteries are not included in the package.
3. Setup Instructions
3.1 Battery Installation
- For the Keyboard: Locate the battery compartment on the underside of the keyboard. Insert two (2) AAA batteries, ensuring correct polarity.
- For the Mouse: Locate the battery compartment on the underside of the mouse. Insert one (1) AAA battery, ensuring correct polarity.
3.2 Connecting the Nano Receiver
- The Nano receiver is conveniently stored in the battery compartment of the mouse. Gently remove it.
- Plug the Nano receiver into an available USB port on your computer.
- Your computer should automatically detect and install the necessary drivers. The keyboard and mouse are pre-paired with the receiver and should be ready for use within a few seconds.

Image: Underside of the keyboard and mouse, highlighting the battery compartments and the Nano receiver slot in the mouse.
4. Operating Instructions
4.1 Keyboard Operation
- Ergonomic Design: The keyboard features an ergonomic design with chiclet-style, flat keys for a comfortable typing experience.
- Shortcut Function Keys: A series of shortcut function keys are available, often used in conjunction with the FN key, to access various system functions quickly. Refer to the key legends for specific functions (e.g., media control, volume).
- Multimedia Keys: Dedicated multimedia keys allow for easy control of volume and music playback.
- Adjustable Tilt Legs: The keyboard includes sturdy adjustable tilt legs on the underside to customize your typing angle for improved comfort.

Image: Close-up view of the keyboard's flat keys and an extended tilt leg.
4.2 Mouse Operation
- 2.4 GHz Wireless: The mouse utilizes advanced 2.4 GHz wireless technology for a stable connection with minimal delays or dropouts.
- DPI Adjustment: The mouse features dedicated DPI buttons (often located near the scroll wheel) to adjust sensitivity. Available DPI settings typically include 800, 1200, 1600, and 2000 DPI. Press the DPI button to cycle through these settings.
- LED Backlight: The mouse is equipped with an edge light LED backlight. To activate or deactivate the backlight, locate the two-way switch on the bottom of the mouse. Turning off the backlight when not in use can help conserve battery life.
- Light Click Design: The mouse buttons are designed for a light click, providing responsive feedback.

Image: Top view of the wireless mouse with its red LED backlight illuminated.
5. Maintenance
- Cleaning: Use a soft, dry cloth to clean the surfaces of the keyboard and mouse. For stubborn dirt, a slightly damp cloth can be used, but ensure no moisture enters the device.
- Battery Replacement: Replace batteries promptly when performance degrades. Always use new, high-quality AAA batteries.
- Storage: When not in use for extended periods, remove batteries to prevent leakage and store the devices in a cool, dry place.
- Avoid Liquids: Do not expose the keyboard or mouse to liquids, as this can cause damage.
6. Troubleshooting
- No Response from Keyboard/Mouse:
- Ensure batteries are correctly installed and not depleted. Replace if necessary.
- Verify the Nano receiver is securely plugged into a working USB port. Try a different USB port.
- Ensure the mouse power switch (on the underside) is in the 'ON' position.
- Move the keyboard and mouse closer to the Nano receiver to rule out range issues.
- Lag or Intermittent Connection:
- Interference from other 2.4GHz devices (e.g., Wi-Fi routers, cordless phones) can affect performance. Try to minimize such interference.
- Ensure there are no large metal objects between the devices and the receiver.
- Mouse Backlight Not Working:
- Check the power switch on the underside of the mouse and ensure it's set to the backlight 'ON' position.
- Replace the mouse battery.
- Keys are too flat/Mouse clicks too easily:
- The ultra-slim design and light click sensitivity are intentional features of this product. Adjusting your typing or grip style may help.
7. Specifications
| Feature | Detail |
|---|---|
| Brand | HUO JI |
| Model | E780 |
| Connectivity Technology | 2.4GHz Wireless |
| Compatible Devices | Personal Computer |
| Operating System | Windows 2000/XP/7/8/10/Vista, Mac OS X, Linux |
| Keyboard Features | Ergonomic, Shortcut Function Keys, Multimedia Keys, Adjustable Tilt Legs |
| Mouse Features | Adjustable DPI (800-1200-1600-2000), Edge Light LED Backlight, Light Click |
| Wireless Distance | Up to 10 meters (33 feet) |
| Keyboard Key Life | Approximately 3,000,000 times |
| Keyboard Size | 54 x 24 x 3 cm (21.26 x 9.45 x 1.18 inches) |
| Item Weight | 2.2 Pounds (approx. 1 kg) |

Image: Dimensions of the keyboard and mouse for reference.
8. Warranty and Support
For warranty information or technical support, please refer to the product packaging or contact HUO JI customer service through the retailer where the product was purchased. Keep your purchase receipt as proof of purchase.