JPhillips-998

I have a complete hot lap timer, transmitter, receiver and display. There is one more box that I can't find on their site. It is a bit bigger than the receiver and has a toggle switch on it (I think it was throttle position and two other positions???). There is also a button that could be hooked up to a steering wheel and a serial port connection but no display? Ideas?

No model # or pic, it is in my car that I just dropped off at the shop.