Detailed Product Description Basic parametersModel: K350 wireless keyboardKeyboard Type: Thin-FilmConnection: 2.4GHz WirelessInterface: USBErgonomic: YesPower Supply: 2 AA batteriesOther features: Support System: Windows XP, Windows Vista, Windows 7; Size: 42 × 25 × 4.6cm; Weight: 848.2g, with no batteries; 929.9g, with 2 AA batteries