Solar TPMS Features: - Solar power charging, dont need to charge by connecting car cigarette lighter. - At the same time, USB charging is also convenient and practical. - Colorful LCD digital displaying, clear to show tire information. - Wireless connect by external sensors, easy install. - Built-in vibration sensor, the car automatically turns on when starting, and automatically turns off when the car stops. - Note: The host must be turned on before installing the sensor. Press and hold the left button for 3 seconds. - For the first time, it is recommended to charge with USB for 1 hour. Solar TPMS Function: - Rear-time monitoring pressure & temperature of 4 tires - Low air pressure /High tire pressure alarm - High temperature / Leakage / Low Battery Alarm Specification: - Adhere to windscreen for installation - Operating frequency: 433.92Mhz 50KHz - Operating voltage: 3.7-5 V - Working temperature: -20 -75 - Pressure Range: 0.5-3.5 Bar - reading difference for external sensors: 0.3 bar / 4 PSI - reading difference for internal sensors: 0.1 bar / 2 PSI