Feature:1. Ergonomic design, more comfortable handfeel.2. Support for Android, for Windows, for Mac OS systems.3. 22key wireless ultrathin numeric keypad, compatible with Bluetooth 5.0.4. Use time up to 80 hours , keystrokes up to 3 million times5. Scissor foot key cap structure design, fast rebound speed, low delay.Specification:Item Type: 22 Keys Numeric KeypadMaterial: ABSOptional Color: Black / Silver Black / Iron Gray / Rose GoldSupport System: for ANDROID, for WIN, for Mac OSNumber Of Keys: 22 KeysCompatible with Bluetooth: Compatible with Bluetooth Version 5.0Keyboard Life (Keystrokes): 3 Million TimesResponse Speed: 5 MillisecondsCompatible with Bluetooth Transmission Distance: Approx. 10m / 32.8ftWorking Current / Voltage: 0.25MA 3VBattery Type & Capacity: 2xAAA (Not Included)Use Time: 80 Hours.Package List:1 x Numeric Keypad (Battery Not Included)1 x User Manual