Product works as described. Easy to install and use. Conveniently plug and play. All you have to do is screw in the marked connectors. Tire sensors come with batteries pre-installed in addition to 2 optional accessories. Plan the first charging of the head unit before use, after that the solar energy comes into play. It is worth noting that the instructions do not recommend driving with the pressure gauges on and a moving car. When there is a problem, the screen flashes and it beeps. Shows PSI and tire temperature (c and f).