Wireless technology - works up to 30 feet of wireless distance. Operates on 12 different channels, each with 65, 536 different IDs. Membrane switch - 5 million keystroke lifecycle for a quiet and fast typing experience. Ergonomic contour design - Minimizes forearm muscles from twisting and pains from carpal tunnel syndrome. Split key design - encourages natural position of hands, wrists and forearms for maximum comfort. Integrated Palm rest - keeps your wrists in the most comfortable position. Built-in scroll wheel - Provides convenience for office applications or web browsing. Compact and portable - ultimate space saver and easy-to-carry on the go. Ergonomic vertical design - The “hand-shake” grip helps reducing pains from carpal tunnel syndrome. Enhanced optical sensor - tracks accurately and precisely on different surfaces, like marble, wood and leather surfaces. Adjustable DPI switch - adjustable cursor moving speed from 800, 1200 to 1600 DPI.