Acme United MW04. Device interface: RF Wireless, Movement detection technology: Optical, Purpose: office. Frequency band: 2.4 GHz. Wireless receiver interface: USB, Receiver type: nano. Power source: batteries, Battery type: AAA. Compatible operating systems: Windows 98/2000/NT/XP/Vista/7, Mouse dimensions (WxDxH): 59 x 98 x 35 mm