1. Introduction
Thank you for choosing the UGREEN K551 Slim Wireless Bluetooth Keyboard. This compact and versatile keyboard is designed for seamless multi-device connectivity, offering both Bluetooth and 2.4G wireless options. With its ergonomic design and quiet keys, it provides a comfortable and efficient typing experience across various operating systems.
Image: UGREEN K551 Slim Wireless Bluetooth Keyboard, showcasing both black and white color options.
2. Product Features
- Triple Connection: Supports Bluetooth 5.3 and 2.4G wireless connectivity, allowing easy switching between up to three devices.
- Wide Compatibility: Compatible with Windows, macOS, iOS, and Android systems, suitable for cellphones, tablets, laptops, game consoles, and computers.
- Ergonomic Design: Features a 9° ergonomic tilt angle for comfortable typing and wrist support.
- Responsive & Comfortable: Utilizes a scissor-foot key structure for a tactile and quiet typing experience.
- Quiet Typing Keys: Operates at a low noise level of ≤40dB, ideal for various office and home environments.
- Long Battery Life: Designed for continuous use for up to 500 days with smart sleep mode, powered by 2 AAA batteries (not included).
- Slim and Portable: Lightweight at approximately 312g and ultra-thin at approximately 0.29 inches, making it easy to carry.
- 70% Compact Layout: A 78-key layout that is fully functional yet smaller, saving desk space.
Image: Keyboard illustrating triple wireless connection capability (2.4G, BT1, BT2).
Image: Diagram showing wide compatibility with devices like cellphones, tablets, laptops, and systems like Windows, macOS, iOS, Android.
Image: Keyboard demonstrating its 9-degree ergonomic tilt angle for comfortable typing.
Image: Close-up view of a key, highlighting the responsive scissor-foot structure.
Image: Keyboard in a quiet setting, emphasizing its low noise level (≤40dB).
Image: Keyboard highlighting 500 days of battery life, smart sleep feature, and indicating the use of 2 AAA batteries.
Image: Keyboard showcasing its light weight (~312g) and ultra-thin profile (~0.29in).
Image: Keyboard illustrating its 70% compact size with dimensions (11.2 in x 4.9 in).
3. Package Contents
Please check the package for the following items:
- 1 x UGREEN K551 Wireless Keyboard
- 1 x 2.4G USB Receiver
- 1 x User Manual (this document)
Note: 2 AAA batteries are required and are NOT included in the package.
4. Specifications
| Attribute | Value |
|---|---|
| Brand | UGREEN |
| Model Number | K551 / 65592 |
| Interface Type | BT Wireless (Bluetooth) & 2.4Ghz Wireless |
| Keyboard Standard | 78 Keys (US-English layout) |
| Operation Style | Mechanical (Scissor-foot structure) |
| Application | Laptop, Tablet, PC, Cellphone, Game Console |
| Features | Wireless, Plug and Play, Spill Resistant, Ultra Thin |
| Keyboard Backlit | LED (for indicators) |
| Material | Aluminum Alloy |
| Battery | AAA*2 (not included) |
| Frequency Response | 2.400GHz-2.4835GHz |
| Transmission Distance | 10m / 33ft (Max.) |
| Size | 285 x 126 x 21mm |
| Net Weight | 315g |
| Origin | Mainland China |
5. Setup
5.1. Battery Installation
- Locate the battery compartment on the back of the keyboard.
- Open the battery cover.
- Insert two (2) AAA batteries, ensuring correct polarity (+/-).
- Close the battery cover securely.
5.2. 2.4G Wireless Connection
- Take out the 2.4G USB receiver from its storage slot (usually on the back or side of the keyboard).
- Plug the 2.4G USB receiver into an available USB port on your computer or device.
- Turn on the keyboard using the power switch.
- Press the dedicated 2.4G button (often labeled with a wireless icon or '2.4G') on the keyboard to select 2.4G mode. The keyboard should automatically connect to your device.
5.3. Bluetooth Connection
The keyboard supports two Bluetooth channels (BT1 and BT2).
- Turn on the keyboard using the power switch.
- Press the BT1 or BT2 button on the keyboard to select the desired Bluetooth channel.
- Press and hold the selected Bluetooth button (BT1 or BT2) for 3-5 seconds until the indicator light starts blinking rapidly. This indicates the keyboard is in pairing mode.
- On your device (computer, tablet, phone), go to Bluetooth settings and search for new devices.
- Select "UGREEN K551" from the list of available devices to pair.
- Follow any on-screen prompts to complete the pairing process. The indicator light will stop blinking and remain solid for a few seconds upon successful connection.
6. Operating Instructions
6.1. Power On/Off
Use the power switch located on the keyboard to turn it on or off.
6.2. Switching Between Devices
To switch between connected devices (2.4G, BT1, BT2), simply press the corresponding button on the keyboard (e.g., '2.4G', 'BT1', or 'BT2'). The keyboard will quickly switch its connection to the selected device.
6.3. Function Keys (Fn Combinations)
The keyboard features a row of function keys (F1-F12) that can be used in combination with the 'Fn' key to perform various multimedia and system functions. Refer to the keycap legends for specific functions (e.g., volume control, media playback, screen brightness).
6.4. Smart Sleep Mode
To conserve battery life, the keyboard will automatically enter a smart sleep mode after a period of inactivity. To wake it up, simply press any key.
7. Maintenance
- Cleaning: Use a soft, dry, lint-free cloth to clean the keyboard. For stubborn dirt, slightly dampen the cloth with water or a mild cleaning solution. Avoid excessive moisture.
- Battery Replacement: Replace batteries when the keyboard's performance degrades or the low battery indicator (if present) illuminates. Always use new AAA batteries.
- Storage: When not in use for extended periods, turn off the keyboard and store it in a cool, dry place. If using the 2.4G connection, store the USB receiver in its designated slot to prevent loss.
- Avoid Liquids: While the keyboard is spill-resistant, avoid direct exposure to large amounts of liquid. If spills occur, immediately turn off the keyboard, remove batteries, and allow it to dry completely before reuse.
8. Troubleshooting
- Keyboard not connecting:
- Ensure the keyboard is powered on and batteries are correctly installed and charged.
- For 2.4G connection, ensure the USB receiver is securely plugged into your device.
- For Bluetooth connection, ensure the keyboard is in pairing mode (indicator light blinking) and your device's Bluetooth is enabled. Try re-pairing the keyboard.
- Ensure the correct connection mode (2.4G, BT1, or BT2) is selected on the keyboard.
- Keys not responding:
- Check battery level and replace if necessary.
- Ensure the keyboard is properly connected to your device.
- Restart your device and try reconnecting the keyboard.
- Lagging or intermittent input:
- Ensure the keyboard is within the maximum transmission distance (10m/33ft) of your device.
- Minimize interference from other wireless devices.
- Check battery level and replace if low.
9. User Tips
- For optimal performance, keep the keyboard and your connected device within close proximity and free from obstructions.
- Always use fresh, high-quality AAA batteries for reliable and long-lasting power.
- Familiarize yourself with the Fn key combinations to quickly access multimedia and system controls.
- When traveling, remember to turn off the keyboard to prevent accidental key presses and save battery life.
10. Warranty & Support
UGREEN products come with a standard manufacturer's warranty. For detailed warranty information, technical support, or service inquiries, please refer to the official UGREEN website or contact their customer service directly. Please retain your proof of purchase for warranty claims.
