Like Ron3rd, I have the TST external mounted system, have had a coupe of glitches but over all just fine. The company's help is Excellent, had trouble setting it up there originally, called and he talked me clear threw it. Monitor is compact and I found a place on the dash, because of that, where it is easily read and heard if that occurs. When we go to an area two stay, say for a week or so, I un-screw them to save on their internal battery's, easy to do and to put them back in their places when ready to roll. Used the original shipping box, with each of their protected plastic cubbie pockets as a storage.