Item Type: Wireless Numeric Keypad Material: ABS Working Current with Buttons: <7.5ma Touchpad Size: Approx. 78 x 110mm / 3.1 x 4.3in Standby Current: <1.6mA Sleep Current: <25uA Working Distance: 10m Sleep Time: 30 Minutes Working Voltage: 3.0-4.2v Charging Current: <1A Key Key Layout: 22 Keys Wake Up Method: Button Wake Up Built in Lithium Battery Capacity: 500mah (included) 1、Ergonomic Design: The ergonomic 7.5 degree angle, combined with the concave arc of the keycap, effectively relieves hand fatigue when using the computer for a long time.  2、Quick Connection: The numeric keypad has BT and 4G dual mode, one key fast switching, fast connection.  3、Touchpad: With touchpad, large multi gestures touchpad, left and right press buttons, easy to use.  4、Plug and Play: Automatic identification for Windows, for Android, for OS X system, plug and play, easy to operate.  5、Small and Portable: Lightweight, small, portable and easy to carry, it is the perfect keyboard choice.