Packing list: manual * 1, keyboard * 1 (battery not included) Product parameters: Connection: 2.4G wireless Size: 26 x 12 x 2.5 cm Product weight: 210g Weight after packing:300g Mouse DPI: 1200 Tracking method: Mouse trackball Power supply: 2pcs AA battery (due to international logistics: no battery is included in the package, please purchase the battery by yourself) Color:Black Button lifetime: 8 million times System requirements:Windows 2000, Me, XP, Vista, Win 7, Linux, Android characteristics: * 2.4 GHZ wireless communication-availble within 9 m and high anti-jamming * More convenient keyboard and mouse integration and faster operation * Optical-sensor truckball controller, eaxact and frequent and positon * Flat and comfortable key design * Muti-languaage partisan * Scroll wheel technology, randomly turn between two directions *Intelligent power indicator lamp * Easy to carry trip or home HTPC and computer applications * Ultra-thin disc, multimedia keys, fixed-point trackball, feel comfortable, reliable, simple structure * Classic key position 78, the installation of 20 multimedia keys, and built a resolution of up to 1000 DPI trackball mouse, * Left and right mouse button in the keyboard around the top of the user to facilitate the use of the remote control, and the other in order to allow users to easily on the desktop, the Bottom right corner of the keyboard also has the mouse left and right keys and wheel keys.