<b>Note</b><br> 1. Only the left and right buttons of the mouse is silent, the two side buttons are not.<br> 2.Please charge the mouse for about 2 hours before first time use it.<br> 3.When you do not use it over 8 minutes, the mouse will enter into sleeping mode,you can click any button to wake it up.<br> 4.This is a rechargeable mouse, no need to change battery. Plug and play, no other driver required.<br> 5.It's out of power if the mouse cursor moves slowly or stop moving.<br> 6.The blue light beside the scroll wheel will be on while charging, and then goes off when the mouse is fully charged.<br><br> <b>Specification</b><br> CPI:2400/1600/800<br> Battery: lithium battery<br> Interface Type: USB<br> Working Type: Optical<br> Wireless Technology: 2.4GHz<br> Buttons: 5 Buttons, 1 scroll wheel<br><br> <b>Package Contents</b><br> 1*Wireless mouse<br> 1*battery(built-in)<br> 1*USB receiver<br> 1*USB charging cable<br> 1*English manual<br>