With 2.4 GHz radio frequency technology, the Adesso iMouse E10 can provide you with wireless convenience and the freedom of a smooth connection without tangled cables for up to a 33 foot range. The special ergonomic vertical design with a soft rubber grip offers a unique and comfortable user experience. With this wrist-friendly contour support, you will hold your hand in a healthy "handshake position" which is the neutral position of your forearm as opposed to the "twisted forearm" position as with a regular mouse. Three convenient buttons on the side allow intuitive control for faster back and forward browsing navigation. The 800/1200/1600 switchable DPI button on the top provides three levels of mouse cursor speed that is useful in different environments. An on/off switch helps to conserve battery power, and an indicator light lets you know when it is time to replace your batteries. iMouse E10 comes with a mini USB receiver that connects automatically without any hassle.