Wireless Mobile Mouse 4000 - black Home, gym, campus, office, quick stop for e-mail and coffee. This sporty, stylish little mouse goes wherever you do. Microsoft Blue Track 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(R) 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. Customizable Buttons - Get quick access to the media, programs, and files you use most often with customizable buttons.