USB 2.0 interface,USB receiver includedPlug and Play,no software required, easy to installWireless, With trackball, Off table and without limitation of operational spacePress then apper laser pointer for presentationScrolling function can be controlled simply by your thumb4 Group DPI:400,600,800,100Special design, can avoid the harm on your wrist and muscle, greatly reduces discomfort for Arthritis and CTS suffersEasy to use - left or right hand, or cradled between bothIdeal for Tablet PC & Laptop & Desktop computerPlace end of index or middle finger on trigger button & thumb on roller ballAAA battery Package Content: 1 x Wireless Finger HandHeld USB Trackball Mouse with laser pointer1 x USB receiver1 x bag