The Logitech Cordless TrackMan Wheel provides you with unprecedented desktop flexibility. Digital radio technology allows it to work without being pointed at the computer, so even on crowded desks, you can use it where and how you want. Work anywhere within a 6-foot radius of the receiver. Optical technology delivers superior precision and performance for detailed work and smooth tracking for longer use. The Logitech cordless wheel boasts long battery life and includes a battery indicator to warn you when the battery is low.