A. This Bluetooth wireless mouse features optical tracking technology, which allows it to work on various surfaces and is suitable for use at home, in the office, or for gaming. B. It has a contact optical design for comfortable use and an ultra-thin, portable construction. C. Utilizing Bluetooth wireless technology, it does not require a USB receiver. (Note: Please check if your computer has a Bluetooth function.) D. System support includes Windows 2000, Windows XP, Windows 7, Windows Vista, Windows 98, OS, Windows ME, and Windows 8. E. The pointing device host interface is Bluetooth, and it is powered by 1*AAA battery (not included). F. Net weight is 56g, item name is Contact Mouse, type is Wireless Mouse, color is white, material is ABS, and size is x 55mm. G. Package contents: 1 x wireless mouse. Only the above package content is included; other products are not. H. Note: Light and different displays may cause the color of the item in the picture to differ slightly from the real thing. The measurement allowed error is +/- 1-3cm.