M240 Silent Bluetooth Mouse Logi

SilentTouch Technology 90% noise reduced Left/Right-click, Middle click ? Sensor technology Smooth optical tracking Nominal value: DPI range DPI range: 400-4000, Steps of 100 DPI Buttons Number of Buttons : 3 (Left/Right-click, Middle click) Scrolling Line-by-line scrolling Scroll Wheel: Yes, 2D, mechanical Battery life Battery life: 18 months ? Battery Details: 1 x AA (included) Connectivity Connection Type: Bluetooth Low Energy Technology Wireless range: 10 meters ? Connect / Power: Yes, on/off switch