The Tire pressure monitoring system allows you to monitor your temperature and pressure of 4 Tires on your entertainment system. The device is made up of four internal tire sensors which send a RF (Radio frequency) transmission to your head unit. The warnings include slow leak detection, fast leak detection, low pressure warning, high pressure warning and will tell you which tire has been compromised. The system also allows you to set the pressure and temperature and which you wish to be warned which is great for 4×4 vehicle.