Genius SlimStar 8000X. 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): 476 x 151 x 21.5 mm, Keyboard weight: 510 g