The device currently offers a switch, available to either hand, that moves the mouse up, down, left, right. You can use them both at the same time for diagonal

The device currently offers a switch, available to either hand, that moves the mouse up, down, left, right. You can use them both at the same time for diagonal movements and same direction movements to increase the speed--but it's nothing you'd want to use in an FPS and that's why you see Riley playing with the CC in one hand and mouse in the other.