A. 2.4 GHz wireless communication available within 9 m and anti-jamming B. More convenient keyboard and mouse integration and faster operation C. Optical-sensor trackball controller, exact and frequent position D. Flat and comfortable key design E. Multi-language support F. Scroll wheel technology, randomly turn between two directions G. Intelligent power indicator lamp H. Easy to carry for trip or home HTPC and computer applications I. Thin design, multimedia keys, fixed-point trackball, feel comfortable, reliable, simple structure J. Classic key position 78, installation of 20 multimedia keys, and built-in resolution up to 1000 DPI trackball mouse K. Left and right mouse buttons on the keyboard for user to facilitate remote control use, and in order to allow users to easily use on the desktop, the bottom right corner of the keyboard also has mouse left and right keys and wheel keys L. 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 supply: 2pcs AA battery (Not included batteries) Button lifetime: 8 million times System requirements: Windows 2000, Me, XP, Vista, Win 7, Linux, Android and Mac Material: Rubber + metal Color: Black & Silver M. Package Contents: 1 * Keyboard 1 * English manual 1 * USB mini receiver Only the above package content, other products are not included N. 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