Good product, I like that it is very easy to assemble. All you have to do is install a sensor on each tire and the monitor will read them instantly. The first day I installed it on my car everything worked great; However, the next day when I turned on my device I noticed that the monitor settings kept resetting (not a big deal as it's easy to set it up to show PSI instead of Bar). On day 3 the front right sensor stopped reading and just blinked on the monitor as if not recognizing it. I tried taking it off which was a bit of a hassle as only the cap came off and the bottom part got stuck on the hoop. After successfully removing it I thought it might be the battery so I replaced it with a new one and put the sensor back in the car and still nothing. I'm disappointed because it's a good product as I know which tire needs air instead of guessing when the tire pressure light will come on on my dash. I'm not sure if I can just replace the sensor and if it connects to the monitor or if everything needs to be replaced. **UPDATE** Mine was replaced with another one. A new one came, I installed it and all the sensors connected well. One thing I noticed is that the monitor doesn't reset from PSI to BAR and F to C when I cycle the machine. Now when I turn on the machine it stays on the PSI setting. I'm giving it 4 runs because it's easy to install, but it can also be difficult to remove the sensors (pliers may be required).