I don't usually write bad reviews but I'm happy to work with the seller to resolve issues, but here... systems. I chose this one because of the good reviews and the display. Installation was easy. I had to re-steam two sensors, but then it showed all four pressures and temperatures. When installed, the outside temperature was 45 degrees. A few days later the temperature dropped to 12 degrees. The temp on the gauge stayed around 40 for all tires. I then increased the PSI from 31 to 35 for all tires. The device did not play this. It still reads 31 and 32 psi. I have emailed Jansite four times about this issue. They asked me to steam the sensors again. Nothing has changed... The other answers I got were that there might be a leak (I know but not 4psi in a few minutes) and that a 4psi difference is acceptable and that the temp in the tire. several times for an exchange or refund but I have not received any replies except that the numbers are normal. For me, 4 PSI difference is unacceptable. Maybe I just don't understand TPMS. But PSI and temps don't change at all so I don't trust the system. I will be purchasing another system from my local auto parts store so I can work with someone locally if I have any problems.