Wireless mouse has a 3-Level adjustable DPI (800/1200/1600), which provides more sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces. | The wireless mouse has a 50ft/15m wireless use range, which reduces interference and delay for you. No need to install any drivers, plug the wireless mouse into the device and you are ready to go! | Only 2 AAA battery(NOT included) lasts up to 18 months. The quiet mouse enters sleep mode to save energy after you leave for 10 minutes, only click any button to resume. Tested for 5,000,000 keystrokes to ensure long-lasting durability. | The ergonomic design allows the silent mouse to fit more closely into your palm, reducing wrist fatigue caused by prolonged use and ensuring all-day comfort. | Silent clicking design for left and right button fits the circumstance for using wireless mouse for laptop in public, such as library, dormitory, office and any other occasions where you do not want to disturb others.