Anleo New Arrival Slim And Sleek Form-Fitting Ergonomic Curved Wireless 2.4 GHz Optical Slim Elegant Design Mouse with DPI Switch 7 For Laptops/Desktop PC XP/Vista/Windows (Colorful Colors, Rose Black Green Pink White) (Pink) Optical tracking technology mouse works on many different surfaces. DPI switch allows for adjustable sensitivity / Powered by two AA batteries (not included). Slim, ergonomically-designed 2.4 GHz wireless mouse ideal for home or office use. Mouse is compatible with most laptop and desktop computers via USB receiver (packaged inside mouse's battery slot). Package Contents: 1 x Wireless Mouse, 1 x USB Receiver.