ProtoArc Wireless Index Finger Trackball Mouse Rechargeable RGB Rollerball BT 2.4g Mice for Computer Laptop 3 Device Connection Color black Gross Weight:250g Operation Mode:Trackball Power Type:Rechargeable Number of Buttons:4 Number of Rollers:1 pcs Hand Orientation:Both Hands Package:Yes Style:Trackballs,Backlight DPI:1600 Interface Type:USB Type:Bluetooth Wireless Brand Name:SEENDA seenDa Model:EM03 Origin:Mainland China