Wireless Optical Mice; size: 89*52*35 mm; AAA Battery Transmitters ensure wide 180 degrees free operation WINDOWS95/98/2000/NT/ME/XP system compatible High resolution up to 800 dpi Automatic sleeping function Operating Distance: 1. 5m Receiving Sensitivity: -79dBm Maximum data rate of 1Mbps Click lifetime: ≥1 million Operating Temperature: -10~50 degrees Battery: Alkaline AA*2 Operating Voltage: +5vdc+5% Operating Electricity: Max20Ma