1.New 2.4G wireless optical mouse 800dpi .
2.You can use it when receiver connect with computer, don't need to press the buttons both on the mouse and the receiver. Usually,  the batteries can help you to work about one week even more long time( such as 2 month).
3.Operate distance: 10M
4.Connector: USB2.0
5.Rating pressure: 15mA  Automatically power-saving sleeping function
6.The most acceleration: 21 inch/sec
7.Mouse net weight: about 35g receiver net: about 10g   
8.Frequency: 402MHz—2480 MHz
9.Driver: Compatible with win95/98/2000/NT/ME/XP/VISTA