FeaturesUltra-thin & modern designBluetooth 4.0 technologyControl media playback from your keyboardBuilt-in number padBlueTrack technologyWith its ultra-thin and modern look, the Microsoft Designer Wireless Bluetooth Desktop Keyboard & Mouse Set complements the look of your desk. It wirelessly pairs to your laptop or tablet with the latest Bluetooth Smart technology– instantly connecting without wires or dongles to manage. A full-sized keyboard with built-in number pad and mouse will keep you productive at your desk.Even with its minimalist design, this keyboard gives you a robust typing experience with chiclet-style, soft touch keys. Media keys are included, so you can easily control music and videos.Dimensions for keyboardLength: 15.32\" / 389.2mmWidth: 4.41\" / 112.2mmDimensions for mouseLength: 2.36\" / 60.1mmWidth: 4.21\" / 107.1mmSystem requirementsRequires a PC that meets the requirements for and installed operating systems:Windows 8, 8.1Windows RT 8, Windows RT 8.1Android 4.4Mac OS 10.10Bluetooth 4.0 enabled devicesOther information4 AAA Batteries