I have been reviewing many of the posts about the new wireless cams. As I have learned they all require power to fire up the camera and many have hooked them the the clearance lights...this is a good...
I got one of these at a garage sale for $10. Works great on batteries and even has audio both directions. I can have my wife hold it and point it as I back up, and we can converse. It also has pan/tilt built in. I fix it to the camper with velcro when I go on trips.