Phoenix Technologies PHM1019NANO. Device interface: RF Wireless, Movement detection technology: Optical. Frequency range: 2.4 GHz. Battery type: AAA. Mouse dimensions (WxDxH): 90 x 52 x 31 mm, Receiver dimensions (WxDxH): 1.7 x 14.3 x 6.3 mm. Compatible operating systems: Windows 98/2000/Me/XP/Vista Mac 0S 8.6 +