Optical tracking technology, working on many different surfaces and perfect usage for home, office or game. Contact Optical mouse, comfortable Contact. Ultra thin design, it is very portable. Bluetooth wireless technology, no need usb receiver.(Note: please check if your computer has bluetooth function) System support: for 2000, for XP,for 7,for Vista, for 98, for OS, for ME, for 8 and high quality. Pointing Device Host Interface: Bluetooth Power Supply: 1*AAA battery (Not Included) Net Weight: 56g Item: Contact Mouse Type: Wireless Mouse Colour: white Material: ABS Size: 111 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.