KUNFINE USB Android TPMS Tire Preure Monitoring System Display Alarm System 5V Android Navigation Car Radio With 4 SensorsNoted1,our TPMS apk is inside the usb device when you connect our usb device with your Android radio you can see the apk inside it and you can install the App 2, our external sensor can change battery while internal sensor can't change battery Main Features:-Solar power charging, LCD color displaying, adjustable brightne-Rear-time monitoring the preure & temperature-Low air preure/high temperature warning-Set up sensor: learn new sensor ID code when replace sensorSensor Specification: Operating frequency: 433.92Mhz Working temperature: -40 -120 Humidity: 0% to 100% Battery life:External sensor> 2 years/ 30,000 km Working preure: 0 99Psi Alarm preure: >46.5Psi or B: Internal TPMS 1 xUSB Android TPMS 4 x Internal sensor