Hoolies Mini Wireless Mouse (Dog Tail) Perfect for home and office use; Optical tracking technology mouse works on many different surfaces Mouse is compatible with most laptop and desktop computer models; Easy to use scrolling function and DPI switch Wireless curved mouse connects via USB receiver; Powered by AAA size battery (battery not included) Package Contents: 1 x 2.4G Wireless Mouse 1 x USB Receiver Please note: The USB receiver is hidden inside the battery compartment of mouse.