I recently got one of these and somehow water got inside and condensation is building up behind the lense...has anyone had any problems with these? The seller i got it from is offering an exchange, but i am just wondering.

That shouldn't happen it's suppose to be water proof.Send it back before the moisture damages the electronics.

got a replacement and its doa!!!

Are you sure you're getting power? Ifso,hook the RCA's to a small monitor that has a RCA input and see if you get a view.Maybe the camera's are bad from the start and you need another supplier!