2.4 GHZ wireless communication-availble within 9 m and anti-jammingMore convenient keyboard and mouse integration and faster operationOptical-sensor truckball controller, eaxact and frequent and positonFlat and comfortable key designMuti-languaage Scroll wheel technology, randomly turn between two directionsIntelligent power indicator lampEasy to carry trip or home HTPC and computer applicationsthin disc, multimedia keys, fixed-point trackball, feel comfortable, reliable, simple structureClassic 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 wirelessSize:26 x 12 x 2.5 cmProduct weight:210gMouse DPI:1200Tracking method: Mouse trackballPower suppply:2pcs AA battery(Not included batteries)Button :8 million timesSystem requirements: 2000, Me, XP, Vista, Win 7, Linux, Android and Material: Rubber + metalColor: Black & SilverPackage Contents:1 * Keyboard1 * English manual1 * USB mini receiverOnly 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. szbym02