Hi-Speed 800 dpi USB Wireless Cordless Mini Optical Mouse w/Receiver Storage Sleek and contoured edges give this mouse a distinctive style. Compact size makes it easy to take with your laptop--around the house or on the road. 800-dpi optical sensor ensures pinpoint sensibility and superior performance The wireless mouse automatically powers off when the wireless receiver is stored in the receiver storage compartment and reducing the chance of you leaving it behind. With switchable wheel scrolling function, you can go through long documents and web pages faster than ever before, get yourself total control of the page on your finger tip Receiver Eject Button, with one touch of the release button, you can eject the wireless receiver stored inside the mouse for simple connectivity