Tire Pressure Monitoring System – 4 Sensor & Repeater Package. Monitor the air pressure and temperature of up to 22 tires in real-time with the iN. Command® Tire Pressure Monitoring System. The waterproof sensors use Bluetooth technology to communicate important safety information right to your smart device with the iN. Command TPMS App. The repeater extends the Bluetooth signal for longer vehicle (up to 100 Meters or 300+ Feet) applications when mounted between the smartphone and rear tires. Just open the Apple or Android App to assign a sensor to each tire by scanning the QR code with your device’s camera to receive audible alerts and notifications. Works with RVs, Trailers, Passenger Vehicles, and More. Each Tire can be Monitored Individually for Pressure and Temperature (F° or C°). Ability to Monitor up to 22 Tires at Once w/ the iN-Command app. Lets you Access Tire Pressure and Temperature History. Free App is Available on Android and Apple Smartphones. Pressure monitoring range: 0 to 185 PSI. Four (4) Bluetooth-Enabled Tire Pressure Monitoring Sensors w/ Locking Anti-Theft Bolts. Four (4) 3V – CR1632 Batteries.