Specification: Support system: For Android, Win, IOS Number of keys: 22 keys Support wireless / Bluetooth: For American Broadcom, Broadcom 20730 Keyboard life (keystrokes): 5 million times Response speed: 5 ms Wireless / BT transmission distance: 10m Working current / voltage: 0.25 mA 3V Battery type: 2*AAA (not included) Package List: 1 * Keypad 1 * Instruction Manual