Enjoy reliable, transceiver-free wireless connection to your PC with Bluetooth Technology Microsoft High Definition Laser Mouse products are more precise, more responsive, and deliver smoother tracking You won't get caught with a dead battery?the Battery Status LED Indicator glows red when the battery is running low Point and click in comfort?ergonomic design helps you work longer without discomfort Use the Back button to easily navigate between folders and Web pages, or press the wheel for auto-scroll