ASUS WT450. Device interface: RF Wireless, Movement detection technology: Optical, Movement resolution: 1200 DPI. Frequency range: 2.4 GHz, Wireless range: 10 m. Power source: batteries, Battery technology: Alkaline, Battery type: AA. Mac operating systems supported: Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion, OS X 10.8 Mountain Lion. Mouse dimensions (WxDxH): 56.5 x 110 x 35.8 mm, Mouse weight: 65.5 g