Optical tracking technology, working on many different surfaces and perfect usage , office or game. Contact Optical mouse, comfortable Contact. Ultra thin design, it is portable. Bluetooth wireless technology, no need usb receiver.(Note: check if your computer has bluetooth function) System support: for Windows 2000, for Windows XP,for Windows 7,for Windows Vista, for Windows 98, for OS, for Windows , for Windows 8 and high quality. Pointing Device Interface: Bluetooth Power Supply: 1*AAA battery (Not Included) Net Weight: 56g Item: Contact Mouse Type: Wireless Mouse Colour: white Material: ABS Size: x 55mm Package Contents: 1 x wireless mouse Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.