Specification:Item Type: 22 Keys Numeric Keypad Material: ABS Optional Color: Silver Black / Iron Grey / Rose Gold Support System: for ANDROID, for WIN, for Mac OS Number Of Keys: 22 Keys Support Wireless: 2.4G Wireless 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: 2 x AAA (Not Included) Use Time: 80 Hours Package List:1 x Numeric Keypad (Battery Not Included) 1 x User Manual 1 x Receiver