Wireless Mobile Mouse 4000 Part Number: BlueTrack™ Technology Plug-And-Go Nano Transceiver 2.4 GHz Reliable Wireless 10-Month Battery Life Windows Flip in Windows® 7 BlueTrack™ Technology Microsoft BlueTrack Technology combines the power of optical with the precision of laser for remarkable tracking on virtually any surface.* Plug-And-Go Nano Transceiver Leave the Nano Transceiver plugged in when you’re on the go, or stow it in the mouse. 2.4 GHz Reliable Wireless Microsoft 2.4 GHz wireless delivers a reliable connection with up to a 30-foot range, with virtually no interference. 10-Month Battery Life Use your mouse without power interruption for up to 10 months on a single battery. Battery status indicator tells you when battery power is low. Windows Flip in Windows® 7 Easily switch between open windows with the click of a button. 4-way Scrolling Scroll four ways for greater efficiency and comfort with Tilt Wheel Technology. 4 Customizable Buttons Get quick access to the media, programs, and files you use most often with customizable buttons. 3 Year Warranty