Rainbow R8657B. Device interface: RF Wireless, Movement detection technology: Laser, Movement resolution: 1600 DPI. Frequency range: 2.4 GHz. Mouse weight: 0.116 kg. Compatible operating systems: Windows 98. Windows 98SE. Windows Me. Windows 2000. Windows XP. Windows 2003. Windows Vista., Mouse dimensions (WxDxH): 129 x 82 x 47 mm, Receiver dimensions (WxDxH): 52 x 20 x 10 mm