The iN•Command® Tire Pressure Monitoring System uses Bluetooth® Low Energy (BLE) technology and waterproof sensors to monitor the tire pressure and temperature in real time. The iN•Command TPMS app can monitor up to 22 tires at a time and will alert you to any change in pressure or temperature with audible and visual cues. The system also uses a Bluetooth repeater for use on longer vehicles to extend the signal from your phone to the very last tire.