Designed with number keys from 0-9, 26 English letter keys and some assistant keys, total are 47 keys.-- With an audio interface, it can be used with any standard 2.5MM earphone.-- With Windows Live Messenger dedicated button, you can store and get the text message in the games and the instant message in the Windows Live Messenger.-- Compatible with XBOX360 wired controller and wireless controller-- Please refer to the user manual for detailed operation-- Working Voltage: 3-3.3V-- Working Current: 0.25-2 mA-- Size(L x W ): Approx. 5.7 x 2.2 inch / 14.5 x 5.5cm-- ABS material colored in black-- -- Package Includes:-- 1 x Xbox 360 chat pad-- 1 x User manual