Ok so I was poking around the car today and noticed this piece. I checked my neighbors S2000 and he doesn't have anything like this. It has a button on the back with the words silence on it. When you push the button the little red light comes on. I also followed the cable up and it seems to run to a box under the dash. It also has what looks like to me a 3.5 headset jack on it. I know its not the end of the world but at this point it is just bugging me so I want to know what it is. So what is it then?

 

Looks like alarm valet switch?

 

yeah looks like an aftermarket alarm indicator light/kill switch

 

definitely aftermarket or the forgot to put that on my car

 

My guess is an aftermarket alarm as well.