BIGtrack has a 3-in/7.6-cm trackball, which makes it the largest trackball mouse available. The large trackball requires less fine motor control than a standard trackball and it is ruggedly built. BIGtrack has a left and a right mouse click button located behind the trackball to avoid unwanted mouse clicks, and switches can be plugged into the two switch jacks to activate the left and right click function. BIGtrack also allows for second mouse connection; both BIGtrack and a second mouse can be connected allowing simultaneous participation. Switches not included.