Tire Pressure Monitoring System - 4 Sensor & Repeater PackageMonitor 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.Features:Works with RVs, Trailers, Passenger Vehicles, and MoreEach 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 appLets you Access Tire Pressure and Temperature HistoryFree App is Available on Android and Apple SmartphonesPressure monitoring range: 0 to 185 PSIIn the Box:Four (4) Bluetooth-Enabled Tire Pressure Monitoring Sensors w/ Locking Anti-Theft BoltsFour (4) 3V - CR1632 BatteriesBluetooth RepeaterInstallation WrenchInstruction Manual