I have never had, or operated a Nitro model, hence the questions

1) Does anyone know if the TQI radio that comes with the Revo Nitro will work with the electric models, i.e Slash, E-Revo?
I think the answer is yes, but I want to make sure before I make the purchase.

2) Will the TQI have full function on the electric models? I know the sensors are a seperate issue all together.

3) What is the red switch for on the handle?

Any input is appreciated. I did a search and couldn't quite find the answers to my questions.
Thanks for your time