Wireless TechnologyWorks up to 30 feet of wireless distance. Operates on 12 different channels, each with 65,536 different IDs. Membrane Switch5 Million keystroke lifecycle for a quiet and fast typing experience. Ergonomic Contour DesignMinimizes forearm muscles from twisting and pains from Carpal Tunnel Syndrome. Split Key DesignEncourages natural position of hands, wrists and forearms for maximum comfort. Integrated Palm RestKeeps your wrists in the most comfortable position. Built-In Scroll WheelProvides convenience for office applications or web browsing. Compact and PortableUltimate space saver and easy-to-carry on the go. Ergonomic Vertical DesignThe "hand-shake" grip helps reducing pains from Carpal Tunnel Syndrome. Enhanced Optical SensorTracks accurately and precisely on different surfaces, like marble, wood and leather surfaces. Adjustable DPI SwitchAdjustable cursor moving speed from 800, 1200 to 1600 DPI. Back/Forward ButtonsProvides extra convenience for web surfing. Auto Sleep and Power On/Off SwitchMaximizes your battery life up to 6 months. Micro-switchUp to 10 million times lifecycle Nano ReceiverTiny and convenient to plug into to your laptop or tablet.