The QuadStick has a joystick, four sip & puff sensors, a lip position sensor, and a push switch, connected to a 32 bit ARM processor that converts the sensor inputs into USB and Bluetooth signals for host devices.
Kickstarter Project – QuadStick: A Game Controller for Quadriplegics
The QuadStick appears to a PS3 or PC host as a Gamepad, Mouse, Keyboard and Flash drive and works directly with them. It can also be used with the Xbox 360 and Xbox One with the appropriate adapter. The logical mapping or connections between the sip & puff sensors and the signals sent to the host are configurable by the user and can be changed between preconfigured profiles, while playing, to match different situations in a game, as demonstrated in the video below:
Website: QuadStick Game Controller