Wireless - Charged by AAA battery (not included) plug and play easy to install. Easy to use - left or right hand or cradled between both. Press then appear laser pointer for presentationOff table and without limitation of operational space. Scrolling function can be controlled simply by your thumb. USB 2.0 interface plug and play no software requiredErgonomic Design - handheld trackball mouse wireless which can avoid any harm on your wrist and muscle greatly reducing the chances for Arthritis and CTS suffersIdeal for both laptops and desktops. Place end of index or middle finger on trigger button & thumb on roller ballPackage Included - 1 x Wireless Finger HandHeld USB Trackball Mouse with Laser Pointer 1 x USB Receiver 1 x bag