From manual
Cymouse is a revolutionary 3-D game controller designed to prodvide you with a new level of game control. Cymouse is a head-worn game controller, so it uses the motion of your head to control games. Because you can use Cymouse as a second set of hands, you don't give up on any of your existing game controllers.

You can use Cymouse with any Windows-based game that supports a mouse, keyboard or joystick. Cyprofiler - the software utility that comes with Cymouse - works in conjunction with Cymouse to let you make amazing moves that you could have only imagined until now. With Cyprofiler, you can perform one command or a combination of commands - up to 50 - with a single head movement!