Excellent for caravans. There are sooo many of these cheap TPMS on Revain without reviews it's impossible to know what's worth trying and even they are varied. For me this is the third. I was determined to find one that worked when it was on the market. Well, that's it. I hooked it up to my truck with the factory TPMS. The first pass grade is for the fact that there is no impairment. Second, it responded precisely to increases and decreases in pressure while driving. Let me add that I checked the actual tire pressure using both a digital gauge and an analog gauge. I'll come back to that. The third test was distance. I have a 25 foot trailer and a 3/4 ton truck with 6 1/2 inch beds. No signal loss issues with the dashboard monitor. So it's accurate and works at a distance good enough to be effective for a hiker. Now some people will say it's not real time and only updates every few minutes. Fair enough. If you take a catastrophic hit or a rapid loss of air, this won't do anything for you. Not your factory system, nothing else on the market. TPMS just gives you confidence that your pressure is ok when you start your journey and that if you pick up a nail and have a slow leak you might have time along the way to do something about it. In any case, this is probably the most apartments, so it's worth it. It reacts quickly enough to alert you to a slow leak that you can respond to. In other words, you most likely won't be able to respond to a quick leak. This is an outlier. A slow leak will be detected with this device with enough warning to go off the road. It is what it is and for the price I'm glad I got it and I won't be without it in the future.