Features: 1.The contoured right hand shape and the curved soft rubber grip guide your hand to a natural and comfortable position. 2.With automatic sleep and on/off switches, the wireless mouse has amazing energy efficiency. 3.The advanced optical tracking allows you to perform high precision movement, easily scrol and turn pages on almost any surface. 4.Click, scroll and move the mouse silently all night without without overworking your hands. 5.A single AA battery (not included) can provide you with enough power and can be used for up to two years without replacing the battery. specification:Item Type: Mouse Material: ABS + Rubber Working Method: Photoelectric Interface Type: USB Connection Method: Wireless Distance: Approx. 10m/11yd Number of Buttons: 3 Roller: Two-Way The Highest Resolution: 1000DPI Transmission Frequency: 2.4GHz Ergonomics: Symmetrical Design Power Mode: 1pc AA (Not Included) Support: For Windows10/8/7, for Mac, for Chrome OS, for Linux PackageList:1 xWirelessMouse 1 xWireless Receiver