Features 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. specificationItem 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 PackageList1 x Numeric Keypad (Battery Not Included)1 x User Manual