Feature: 1. Ergonomic design, more comfortable handfeel. 2. Support for Android, for Windows, for Mac OS systems. 3. 22-key wireless ultra-thin numeric keypad, compatible with Bluetooth 3.0. 4. Use time up to 80 hours , keystrokes up to 3 million times 5. Scissor foot key cap structure design, fast rebound speed, low delay. Specification: Item Type: 22 Keys Numeric Keypad Material: ABS Optional Color: Black / Silver Black / Iron Gray / Rose Gold Support System: for ANDROID, for WIN, for Mac OS Number Of Keys: 22 Keys Compatible with Bluetooth: Compatible with Bluetooth Version 3.0 Keyboard Life (Keystrokes): 3 Million Times Response Speed: 5 Milliseconds Compatible with Bluetooth Transmission Distance: Approx. 10m / 32.8ft Working Current / Voltage: 0.25MA 3V Battery Type & Capacity: 2xAAA (Not Included) Use Time: 80 Hours Package List: 1 x Numeric Keypad (Battery Not Included) 1 x User Manual