BIGtrack 2.0 is USB mouse that includes a large 3-in / 7.62-cm trackball and over-sized left and right click buttons. BIGtrack 2.0 can be used with one or two switches and includes an easy-to-use drag lock feature. The sturdy base of BIGtrack 2.0 allows the user to easily move and position the mouse cursor on the computer screen while using fine or gross motor movements of the hand, arm, or foot. Once the mouse cursor is positioned, two over-sized buttons are available for left and right clicking..BIGtrack 2.0 is USB mouse that includes a large 3-in / 7.62-cm trackball and over-sized left and right click buttons. BIGtrack 2.0 can be used with one or two switches and includes an easy-to-use drag lock feature. The sturdy base of BIGtrack 2.0 allows the user to easily move and position the mouse cursor on the computer screen while using fine or gross motor movements of the hand, arm, or foot. Once the mouse cursor is positioned, two over-sized buttons are available for left and right clicking..