Non-Noise Silent Click Mouse ideal for office library school and hospital. Wireless Gaming Mouse Noiseless Buttons Precise positing Optical Wireless Gaming Mouse 2.4GHz wireless technology can provide reliable connection within 360 degree and 30 meters without any interference. A new generation of low-power technology five times more than ordinary wireless power battery life of to 20 months eliminating the trouble of frequents replacement batteries. Return rate shows the speed transferring data playween the mouse and computer.250Hz return rate allows wireless mouse have to delay nor jump frame in fierce games .It has more practical significance for competitive gamers. High precision game 1000-1600-2400 PI switch to ensure taht the game process quickly locate the object. Silent micro-pres.Click sound is reduced about 95% than other mouse truly realizing no interference in the same room with high quality keys. It has a service life of up to 300 million times. Specification Data transmission:1Mbps; Frequency:2405MHz-2476MHz; Channel:16; Engine:Optical; Distance:30m; Voltage:3V; Current:4mA; Mouse key life:Above 3 millions; Mouse Size:4.6x2.9x1.5Inch/117x73x38mm; Mouse Weight:75g; Stpe current: Working current=4mA; Standby current=0.1mA; Dormancy current=50uA No receiver state=10-25uA Tracking performance Mouse Resolution; 1000-1600-2400dpi; Mouse Rate of return:250Hz; System requirement: IBM or compatible computer; Windows:2000/me/xp(x64); Vista/7/8/10; Mac OS X (More than V10.4) Workable USB port Package Contents 1x Wireless mouse 1xNano receiver 1x Quick start guide.