[Stable Connection]USB 2.0 Wired technology, Plug and Play, no device drivers, signal transmission stability, no delay number pad, TPE - protecting cord. [Full-Size 18 Keys Keypad]Professional 18 full-size and concave 18 keys design, applicated in sock, notebook computer, banking, school, company etc. Numeric Keypad's keycaps life of more than 10 million times. [Ergonomic Design]ABS Material, Small, Slim design, Numeric Keypad is easy to take with you, 18 Keys USB number pad are easy and silent to press, Ergonomic tilt and anti-slip pads on back provides comfort. [Compatible]Numeric Keypad compatible with Android Tablet PC, Linux, Desktop, Chromebook Windows XP / Vista / 7 / 8 / 10 series. [Power Saving ]No battery required, It enters into hibernation/sleep mode automatically, energy saving, extended service life, don't have to worry about your Numeric Keypad for laptop will be no power. colour:black Material:ABS size:134mm x 85mm x 22mm Package Contents: 4 x Wired Keyboard Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.