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 5.0. 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 5.0 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