Plug and Play: 2.4G Advanced Wireless Connectivity Technology, Without any hassle of wire and driver, just Plug and Play, the computer mouse is ready to use. Support 50ft/15m wireless range. (1 AA battery needed but not included) Smart Energy Saving: The slim travel mouse will auto sleep after 8 minutes of inactivity, so that to extend the AA battery life(click any button to wake the mouse up). An ON/OFF switch will allow you to turn it off whenever you want. Compact and Lightweight: Portable compact size 4.7*2.6*1.4in, Weight 2.89 oz, the USB mouse is portable and easy to carry with you to any occasions, at cafes, home, office or library. Noiseless Click and Comfort: Quiet clicks free your worry about bothering others and keep you stay focused while working and studying. Slim ergonomic design and smooth frosted surface makes it more comfortable for your hands. Wide Compatibility: Work with Windows XP, Windows Vista, Windows 7, Mac OS X 10.4 etc. (Not compatible with macbook pro or other laptops which only have Type c ports).