Bluecell White 2.4G RF DPI Blue Optical light wireless USB Mouse for Apple macbook 13" PRO AIR 11" ACER SONY HP DELL LENOVO TOSHIBA ASUS Wireless curved mouse connects via USB receiver; Powered by one AA size battery (battery not included) For all laptop and desktop support USB 2.0 Works with Windows 2000, XP, Vista, 7, and 8 Slim ergonomic mouse is perfect for home and office use; Optical tracking technology mouse works on many different surfaces Nano Receiver : Small enough to plug in once and leave connected. 1. If the cursor moves the wrong direction, slow response or randomly disconnect, please replace a new battery. 2. If you don't connect, please insert the receiver another USB interface of computer and restart. 3. If you don't use for a long time, please turn off the mouse power switch.