Welcome to our store! 1. Intelligent magnetic induction automatically starts or shuts down the machine, compatible with the three major operating systems for iOS/Android/WINDOW 2. Supports multiple devices, can connect 3 devices simultaneously, easy to switch 3. Scissor keyboard structure, the keyboard has simple concave keys, the operating force is balanced 4. Uses scissor structure, the keyboard sound is low, the rebound effect is good, the operation is comfortable and the hand feel is outstanding 5. Uses a unique rolling design with a small size, easy to carry and can be placed directly in the bag Item Type: Foldable Keyboard Bluetooth Solution: For Broadcom v3.0 Bluetooth Protocol: For HID Operating Distance: Approx. 10 meters / 32.8 feet Operating Frequency: 2402~2480MHz Operating Environment: 10℃ ~ 40℃ Battery: 1xAAA (not included) Operating Voltage: 1.5V Low Voltage Prompt: ≤1.1V Operating Current: 2.5mA Working Time: 288 hours Supports Multi-Connection: 3 devices multi-connection Supports Switching: Press the switch button to switch between the three devices Compatible: For iOS/Android/WINDOW three operating systems Magnetic induction switch design How to use: 1. Fold out the keyboard and turn on Bluetooth on your device 2. Press the Fn and C keys on the keyboard, at this time the blue LED light will flash and the keyboard will enter standby mode to connect 3. The device searches for the connection, finds \"R4 Keyboard\" and clicks to connect 1 x Keyboard 1 x Storage Bag 1 x User Manual Customers are our top priority. If you find any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best customer service.