Gembird MUSWN Wireless optical mouse. Device interface: RF Wireless, Movement detection technology: Optical, Movement resolution: 1600 DPI. Frequency range: 2.4 GHz, Wireless range: 8 m. Battery type: AAA. Mouse weight: 57 g, Receiver dimensions (WxDxH): 6 x 14 x 21 mm, Receiver weight: 2 g. Compatible operating systems: Windows 98SE/2000/XP/VISTA, Depth: 61 mm, Height: 37 mm