Targus AMW26US Wireless Laser Stow-N-Go Laptop Mouse - Grey and Black Stow-N-Go Receiver  Wireless receiver attaches securely to the bottom of the mouse for convenient transport Functionality Tilt wheel* provides 4-way scrolling capabilities for easy navigation; Switchable 1,600/1,200/800 dpi resolution allowing for adjustable cursor speeds, ideal for todays widescreen notebooks and features Power Conservation  Conserve power with the On/Off switch triggered by the receiver for up to 6 months** of battery life; integrated indicator light informs the user when power is low; two AA batteries are included System Requirements  Windows 2000, XP, Windows Vista or Mac OS X (or higher), USB port required RoHS Compliant