Review on HD 1080P Wireless RV Backup Camera System - 7 Inch DVR Monitor with Car/Truck Camera and 2 Infrared Rear View Cameras for Trailers, Motorhomes, and 5th Wheels - Pre-wired RV Adapter Included - Yakry Y33 by Jason Wright

First of all it is much cheaper than the often recommended ones. I hesitated to buy because I didn't see many reviews. Revain's return policy solved this problem. I also liked the 5 inch screen. The 7" screens of comparable but more expensive devices were too big for my dashboard! When I hooked up a backup camera to my license plate it worked correctly. one way. It helps with hitch hitch on my trailers. When I plugged in the trailer cam on wheels, it didn't work. I then ran the scan command and it worked great while driving at speeds up to 45mph. Also the backlog was quite large. Tech support was VERY HELPFUL and advised me to buying an external antenna that can be installed on a camera or monitor. I've done this and it works great. Maybe a little delay but not enough to notice it. The catalog number of the antenna is Yakry Y68. It works really so if you buy the whole system just buy it I can install it on my RV but ben for now I use it on the roof of my truck and it works really well. Length).