Optical Sensor – Optical sensor technology improves precision and even lets you work on most surfaces like marble, wood and leather surfaces without the need of a mouse pad. With an optical resolution of 800/1200/1600 DPI, you can browse comfortably basically on any surface. 2.4 GHz Wireless Technology – The 2.4GHz Wireless Technology has 65536 IDs with 12 channels and works up to 30 feet. This provides the reliability to ensure your other wireless devices will not interfere with your device. Battery Saving – With the built-in Auto-Sleep features, you can automatically maximize your battery life when your device is not in use. Adjustable DPI Switch – With three selectable DPI options from 800 to 1600, users can change their desired DPI settings. Fabric Surface – Contoured body with soft canvas fabric cover comfortable grip-feeling without any fatigue for long time use.