Wireless, Powered by AAA battery (not provided), plug and play, easy to install. Simple to use with either the left or right hand or cradled between the both Press for laser pointer appearance for presentation. Off table and without limits of operational space. Your thumb can easily manage the scrolling function. USB 2.0 interface, plug and play, no software required. Handheld trackball mouse wireless, which can avoid any harm on your wrist and muscle, greatly reducing the chances for Arthritis and CTS suffers. Perfect for both desktops and laptops. Put your thumb on the roller ball and the tip of your index or middle finger on the trigger.