The FOBO Tire Plus monitors real time car tire pressure and temperature 24/7 and provides 3-level alerts. FOBO Tire Plus is an advanced tire pressure monitoring system which uses latest Bluetooth 4.0 that works directly with your Android and iOS device. With an intelligent In-Car monitoring unit that works on its own or simultaneously with your smart phone, FOBO Tire monitors up to 600 kPa (87 psi) and give you an alert in the absence of a smart phone. Comes with 4 tire sensors and 1 in-car unit.