1. Introduction
The Cellet Ultra Slim Folding Wireless Keyboard is designed for convenience and functionality, allowing you to compose correspondence with accuracy and ease across various devices. Its foldable, ultra-slim, and lightweight design makes it an ideal portable accessory for smartphones, tablets, laptops, and computers.

Image: The Cellet Ultra Slim Folding Wireless Keyboard in its unfolded state, ready for use.
2. Important Safety Instructions
- Before using this product, read all the instructions carefully and keep them for future reference.
- This product can be used by children and people with physical, sensory, or mental disability or lack of experience and knowledge if they have been given proper supervision or instruction concerning the use of the appliance in a safe way and understand the hazards involved.
- Cleaning and maintenance should not be carried out by children without supervision.
- Children should be supervised to ensure that they do not play with the appliance.
- Keep product away from fire or excessively hot areas.
- For indoor use only. Do not expose to water, excess moisture, or snow.
- Do not place product in or near inflammable, explosive, or hazardous objects.
- Do not damage product with damaged cord or plug.
- Do not use product if it has been damaged in any way.
- Do not disassemble the product. Disassembly may result in a risk of safety hazards.
- Do not throw or shake product.
3. Product and Accessories
The package includes the following items:
- Cellet Ultra Slim Folding Wireless Keyboard
- USB-C Charging Cable
- User Manual
- Keyboard case (doubles as a smartphone or tablet stand)

Image: The complete contents of the product package, showing the keyboard, USB-C cable, and the keyboard case which functions as a stand.
4. Before First Use
Before using your keyboard for the first time, ensure it is fully charged. Connect the provided USB-C cable to the keyboard's charging port and a power source. Charge the keyboard for approximately 1.5 to 2 hours.
Charging Indicator Light:
- Flashing Red: Battery low, needs charging.
- Glowing Red: Charging.
- OFF: Fully charged.
5. Keyboard Specifications
| Feature | Description |
|---|---|
| Wireless Version | 5.1 |
| Operating Distance | Up to 10 meters |
| Modulation System | GFSK |
| Operating Voltage | 3.0-4.2V |
| Operating Current | <3.0mA |
| Standby Current | <0.3mA |
| Sleep Current | <40uA |
| Charging Current | >200mA |
| Standby Time | Around 100 days |
| Charge Time | 2 hours |
| Lithium Battery Capacity | 110mAh |
| Uninterrupted Working Time | >40 hours |
| Lithium Battery Life | 3 years |
| Lithium Battery Dimensions | 3.0*35*23mm |
| Key Force | 50-80g |
| Key Life | 3 million strokes |
| Working Temperature | -10 ~ +55 ℃ |
6. Pairing Steps
Follow these steps to pair your keyboard with your device:
- Open the keyboard. The status indicator light will be on for 3 seconds and then turn off.
- Press Fn + C (Bluetooth) keys. The Bluetooth indicator light will start blinking.
- Activate Bluetooth function on your device and search for available devices.
- Select "Cellet BKP200 Keyboard" on your device to connect.
- Once connected, the Bluetooth indicator light will turn off.
Switching Between Devices:
This keyboard supports connecting to multiple devices. To switch between paired devices, press and hold the Fn key and then short press 1 or 2 key to switch between devices.

Image: A page from the user manual detailing the pairing process and various function keys.
Video: Demonstrates the Bluetooth keyboard for phone, showing how to connect and use it with a smartphone.
7. Operating Instructions
The keyboard features several function keys and shortcuts for enhanced productivity across different operating systems.
Universal Function Keys:
- Fn + F1: Previous track
- Fn + F2: Volume down
- Fn + F3: Volume up
- Fn + F4: Next track
- Fn + F5: Play/Pause
- Fn + F6: Switch language
- Fn + F7: Search
- Fn + F8: Copy
- Fn + F9: Paste
- Fn + F10: Select all
System-Specific Keys:
- In Android Systems:
- PgUp: Last page
- PgDn: Next page
- In iOS Systems:
- Home: Home
- PgUp: Cursor to the top
- PgDn: Cursor to the bottom
- In Windows Systems:
- Web browser: Web browser
- ESC: ESC
- PgUp: Last page
- PgDn: Next page

Image: The keyboard case is shown functioning as a stand, holding both a smartphone and a tablet for convenient viewing while typing.
Video: A demonstration of the XK04 pocket-size portable keyboard, highlighting its compact design and ease of use in various settings.
8. Cleaning and Maintenance
- Clean the keyboard with a soft, damp cloth dampened with water or alcohol.
- Keep the keyboard away from sharp objects.
- Do not place heavy objects on the keyboard.
- Do not microwave the keyboard.
- Do not force or distort keyboard.
- Keep away from oil, chemicals, or any other organic liquid.
9. Environmentally Friendly Disposal
- Pry up plastic top and remove it completely. This action destroys the keyboard.
- Turn top over and remove tape from battery.
- Separate battery from circuit board.
- Dispose of battery according to local laws. Recycle remaining keyboard parts.
10. Troubleshooting
- Keyboard not connecting: Ensure the keyboard is charged and powered on. Make sure Bluetooth is enabled on your device and the keyboard is in pairing mode (Fn+C). Try resetting the keyboard by turning it off and on, then re-pairing.
- Keys not responding: Check battery level. Ensure the keyboard is properly paired. Try restarting both the keyboard and your device.
- Charging issues: Use the provided USB-C cable. Ensure the power source is working. Check the charging indicator light for status.
- Unstable connection: Ensure your device is within the 10-meter operating range. Avoid interference from other wireless devices.
11. Warranty and Support
For warranty information and technical support, please refer to the documentation included with your product or contact Cellet customer service directly. Keep your proof of purchase for any warranty claims.