Fangrui Product Details 1. Car Solar Wireless Tire Pressure Monitoring System Tpms 6 External Sensors For 6-wheel Truck Bus 2. Features 3. Use Lithium Battery And Solar Panel For Charging, With 6 External Sensors. 4. Lcd Panel With Additional Mini Usb Port For Charging. 5. Lightweight Sensor Design, Easy To Install. 6. Monitor Temperature And Pressure With High Accuracy, Display 6 Tires At The Same Time. The Display Can Be Switched To 4 Tires. 7. Save Fuel, Check For Air Leaks, Reduce Tire Wear, And Balance Tires Pressure To Ensure Safe Driving. 8. Rf Wireless Technology, Can Automatically Alarm Under Tire Pressure And Pressure The Temperature Is Abnormal. 9. Support Tire Position Exchange Function. 10. Suitable For Trailers, Vans, Rvs, Campers, Trucks, Minivans, Etc. 11. Specification 12. Pressure Range: 0-116psi 0-8bar 13. Operating Frequency: 433.92mhz 14. Temperature Unit: Deg.c Deg.f 15. Working Voltage: Dc5v 16. Waterproof Grade: Ip67 17. Sensor Battery: Built-in Cr1632 Button Battery 18. Receiver Battery: Built-in 400mah Polymer Lithium Battery 19. Receiver Charging Method: Usb, Solar