Features: 1. Alloy and plastic bonding materials. 2. The notebook flap cover is designed with a sleep function. 3. Ergonomic design, high quality and high surface oxidation treatment, ABS comfortable scissors foot button, and colorful backlight LED backlight with adjustable brightness, switching and fixing. It is suitable for various occasions, small and convenient to carry. Parameters: 1. Main material: aluminum alloy, ABS plastic. 2. Number of keys: 78 keys. 3. Bluetooth chip and version: Bluetooth 3.0. 4. Power supply: Built-in high capacity 400 mA rechargeable lithium polymer battery. Battery life: 3 years. 5. Use working voltage: 3.2-4.2V. 6. Button life times: 500 million times. 7. Effective use distance: 10 meters. 8. Bare metal product size: 254x189x16mm. 9. Charging time: 4-5 hours. 10. Standby time: 100 days, continuous working time: 70 hours. 11. System Support: Supports all Apple iOS systems for Apple iPad Pro 11 inch (2018) tablets. Bluetooth connection method: 1. Turn on the power switch (open the protective case 80 degrees power supply is turned on), it will light blue when it is turned on normally (it will turn off automatically after about 3 seconds). 2. After turning on the power, press the Bluetooth pairing switch (Fn+C Bluetooth enabled). When the Bluetooth is turned on, the indicator light will flash blue and flash. This means that Bluetooth can be paired. 3. After the keyboard Bluetooth is turned on, the Bluetooth on the tablet machine is turned on (Settings - Bluetooth). After the Bluetooth of the tablet machine is turned on, search for the Bluetooth of the Bluetooth keyboard (usually display ipad Keyboard English) and then click the connection (do not lose the pairing password) ), if the connection is successful, the connection will be displayed, indicating that the connection is successful, you can use the Bluetooth keyboard.