Chunshop USB 2.4G Cordless Wireless Optical Mouse Mice Receiver For Laptop PC Computer Blue Enjoy gliding across your desk without having to use a mouse pad with this wireless optical mouse. It can be used on almost any surface because it uses sensors to record the movement optically. With 6 Keys, including Scroll Wheel, Page Forward and Page Backward buttons for easy Internet Surfing To install the wireless mouse:While the mouse is turned off, connect the USB receiver into the computer, then turn on the mouse Mouse size:100x 65 x 35mm, USB receiver size:18 x 14 x 5mm, Power:2 x AAA battery (not included)