 Pretty small, and they fit in there. But the cord is probably your biggest problem where you're going to do that. But the last couple I've had have been really tiny, and they've been pretty weatherproof. Yeah, the last couple I bought from Napa, Jeff, I agree with Steve. They're not more than probably a couple decks of cards. That's about all the bigger they are. Yeah, cell phone size. You can hide one of those in the engine compartment pretty easily. Yeah, my concern is that if you have a lot of rain or snow or stuff going in,