Wireless DesignCharged by AAA battery, plug and play, easy to install For Left/Right HandLeft or right hand, or cradled between both. Press then appear laser pointer for presentation Driver FreeOff 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 required Ergonomic Design Handheld trackball mouse wireless, which can avoid any harm on your wrist and muscle, greatly reducing the chances for Arthritis and CTS suffers Easy to UseIdeal for both laptops and desktops. Place end of index or middle finger on trigger button & thumb on roller ball Specifications: Model: Y-10W Right/left hand: universal Power supply: AAA battery (not included) Interface: USB Size: 11x6x5cm Wireless receiving distance: 10 meters Resolution: 1000DPI Package included: 1 x Finger Trackball Mouse 1 x Receiver 1 x Storage Pouch 1 x English and Chinese User Manual Other items not include