After doing a great amount of research and review reading, I bought the Tymate solar TPS for my RV before picking it up. When it arrived, I tested it out on my car. What a pain. The sensors needed to constantly be re-synced, or tire positions changed. The buttons on the unit didn't function, and I would get stuck at a point in the menu and not be able to get out. The instructions were poor, and the unit did not respond according to the instructions. I spent over almost two hours putting things on, taking them off, putting them back on, taking them back off, resetting, reconnecting, and the until still didn't display things correctly or function correctly. I thought about getting a replacement or possibly upgrading, but if it takes this long to diagnose an inexpensive Chinese piece of junk, I'm not going to waste any more of my time. I'm buying a more expensive reliable unit with a respected name and reputation. You get what you pay for. Don't buy this unit.

UPDATE - against my better judgement, and largely because the other TPMS I was interested in was twice the price, and because there were so many good reviews, I decided to give this TPMS another go and I ordered a replacement hoping that I got a lemon the first time. The good news is, so far, so good. I have tested it on my Prius and everything is working as it should. However, I bought it for a new travel trailer that I will be picking up in a few weeks, so I'm reserving final judgement until I use it on the trailer. I'm raising my initial rating from 1 star to 3 stars. Based on current functionality I would give it 4 stars (not 5 because the instructions are terrible), but I don't think I should have had to order a second unit to get one that works, so the 3 star will remain. I actually think part (not all) of my former problems were caused by the very poorly written instructions. I mean, there's not even any mention of the fact that the sensors have a CR1632 battery that you can change when it goes dead, much less how to do it. The instructions talk about standby mode. What I have learned with this second unit is that standby mode is when the unit is on an functioning. It isn't a special screen or mode you have to get into with the push of some button sequence. The instructions talk about holding the '-' and 'set' buttons together. DON'T DO IT!!!!!!! It's the factory reset, which knocks out the units recognition of the individual sensor codes. I think this is part of what messed me up with the first unit, although I still maintain that buttons weren't working when pressed. I also observed that you can't turn the unit on and off when the USB power cable is attached. The unit has to be unplugged, running on solar, to be powered on/off. By the way, you hold down the '-' button for 5 seconds for that, until you hear a beep. I'll write another update in a few weeks after I've used the unit on my travel trailer trip.

UPDATE 2 - Just returned from a 2 week trip using this TPMS. It worked flawlessly. I have no complaints. I would have adjusted my rating up to 5 stars, but left it at 4 because of the first unit I received that didn't work. After using this, I can't think of any reason to put out a lot more money for a more expensive unit. I have a 24' trailer being towed by a Toyota Highlander. Reception was not an issue at all. I'm thinking about getting another set for the Highlander.

Installed easily, accuracy is good, connectivity could be improved. After a couple of trips usage on our travel trailer very happy with the purchase.

3 of the sensors worked fine, one had a dead battery. Like dead-dead. I measured 0.3V out of 3.0V so I don't know how this one passed any level of quality control. Other batteries were still 3.0V. An $8 battery later and all 4 sensors work great now. I carry an extra battery in my kit now. Hopefully it was a dud battery and this sensor isn't draining them. Will update if it is a dud.
Note that you can flick the valve stem and wiggle the sensors to wake them up after sitting a long time. My screen updates all 4 tires within 2 minutes before we get on the road. I added valve-stem-wiggling to my camper road-ready-checklist.

Added to a 21-foot sea ray boat trailer, easy to setup. Seems to be very accurate. No issues with the first 200 miles. Did remove before launching the boat (not sure if i needed to)

I don't write reviews very often and I was a bit skeptical about this product as similar units are much more expensive. That said, so far I am extremely impressed with the unit. Installation/instructions were very clear and easy to follow and install. I installed the unit on my 31' travel trailer with an extended cab F-150. After receiving the package, I saw there was an optional signal antenna. Given the distance between the unit and the valve sensors, I was certain I was going to need the antenna. To my surprise when I installed the unit, it started working right away. All in all I think this is a great product. Note, when turning the unit on at a later time, it takes a few minutes for it to receive the signal from the sensors. I have not made a road trip with this yet, however nothing gives me much concern it won't function the same once in motion. Definitely recommend the product!