Silent button, creating a quiet and comfortable environment. 2.4g wireless

transmission distance up to 8-10 meters. Red light optical technology, 

accurate positioning. Ergonomic shape design, right and left. Third gear DPI

adjustable 800-1200-1600. Built-in NANO receiver, easy to carry. Automatic

sleep technology, up to 6 months of battery life. Last One! FAST SHIPPING USA!