Genius SlimStar 800. Device interface: RF Wireless, Keyboard form factor: Standard, Keyboard style: Straight. Movement resolution: 1200 DPI, Movement detection technology: Optical. Frequency band: 2.4 GHz. Wireless receiver interface: USB. Keyboard dimensions (WxDxH): 450 x 120 x 19.8 mm, Keyboard weight: 450 g