2.4 GHZ wireless communication-availble within 9 m and 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 <br><br>Scroll wheel technology, randomly turn between two directions Intelligent power indicator lamp Easy to carry trip or home HTPC and computer applications 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 for 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. Product parameters: Connection:2.4G wireless Size:26 x 12 x 2.5 cm Product weight:210g Mouse DPI:1200 Tracking method: Mouse trackball Power suppply:2pcs AA battery(Not included batteries) Button :8 million times System requirements: 2000, Me, XP, Vista, Win 7, Linux, Android and Material: Rubber + metal Color: Black & Silver<br><br>Package Contents: 1 * Keyboard 1 * English manual 1 * USB mini receiver<br><br>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.