This special verticle design with a soft rubber grip creates a unique and comfortable user experience. Its 2 buttons located conveniently on the side allow for faster back and forward browsing control. There are 3 available levels of DPI resolutions (800/1200/1600) adn with its 2.4 GHz RF technology, this mouse is wireless up to a range of 30 feet. To conserve battery power, there is a built in on/off power switch as well as an indicator light to let you know when it's time to replace your battery. This mouse also comes with a mini-receiver that connects automatically.Key Features: 2.4GHz Wireless Technology; Battery Saving on/off switch; Verticle Ergonomic Design' Adjustable level DPI Switch; Enhanced Opticle Sensor; Automatic Synchronization