TN401 Wireless Solar Power Internal Sensor TPMS Tire Pressure Monitor TPMS which means a tire pressure monitoring system, it uses automotive electronic technology, sensor technology & wirelesscommunication technology to monitor the tire pressure & temperature in the car driving. It will give alarm on a flat tire, abnormal temperature rise & low pressure, so that to avoid traffic accidents & protect drivers & passengers life. Specification: Work Temperature- 40℃ ~ + 120℃ Temperature Sensitivity 3℃ Pressure Range 0 ~ 4.5bar (116 psi) Pressure Sensitivity 0.1 bar (1.5 psi) Transmission Power 10 d Bm Transmission Frequency 433.92 MHz Battery Life 5 years High pressure alarm adjusting range 2.5 Bar ~ 4.4 Bar (36 ~ 63 Psi) Low pressure alarm adjusting range 1.1 Bar ~ 2.5 Bar (15 ~ 36 Psi) Sensor Battery CR1632 (Replaceble) Feature:1. Black-&-white display screen 2. Displays pressure & temperature of 4 tires simultaneously 3. High temperature, High pressure, Low pressure alarm 4. Free to set high & low pressure limit alarm value 5. 4 internal sensors 6. With wide temperature explosion-proof battery 7. Support solar charging, USB port charging Package Included:1 X Solar Displayer 1 X Anti-slip Mat 4 X Internal Sensor 1 X User Manual