Great little gadget. I bought it for an older car that didn't have tire pressure monitoring. Installed in 5 minutes and works great. You can monitor real-time pressure and temperature. It also shows the voltage of the vehicle. The batteries in the sensors are replaceable. The only downside is that you first have to drive at 20km/h or more to wake up the sensors. I think this is to save batteries in the sensors. I'm not sure how long the idle time is before the sensors go back to sleep.