Universal TPMS Wireless Tire Pressure Monitoring System Solar Power Color LCD Display with 4 External Sensor Tire Pressure Alarm [SOLAR POWER & USB CHARGING]: 2 charging ways which ensure the tire pressure monitoring system will work continuously, and do not occupy the car cigarette lighter socket. [6 ALARM MODES]: fast leak alarm, slow leak alarm, high pressure alarm, high temperature alarm, sensor fault alarm and sensor battery low power alarm, ensure safe driving. [ Press any button will stop alarming ] [DIGITAL LCD SCREEN]: the monitor displays real-time pressure & temperature, it can be placed anywhere stably and you can easily read the data. [EASY TO USE]: 4 wireless external sensors, easy installation and receive real-time signal. The pressure and temperature data can be switched (default 0.5- 3.5Bar), with pressure unit: PSI/Bar and temperature unit: C/F selectable. New TPMS-With Electronic Clock Accurate Display, Long Standby High-quality Materials, Can Be Used For Years High-end chip, quickly read tire pressure. The whole machine is made of heat-resistant materials and passed multiple high-temperature tests. Questiosns & Answers 1. How to turn on the device? When you receive the device, please charge it for 3 hours, then, long press left button to turn on the device. 2. The sensor is showing"0.0" or "-", what can I do? Under this situation, we should try to install the sensors again or pair the sensors to the display again. If you don't know how to do pairing, please check the manual or , we will guide you. 3. What's the difference for external sensors and built-in sensors? -External sensors are easy to install, they have 0-0.2 reading difference. The battery inside is replacable, battery lifetime is about 1 years, battery type is CR1632. -Built-in sensors could detect accurate reading, battery is not replacable, battery lifetime is about 4-5 years. 4.What's the pressure detecting tange? The range is 0.5 - 3.5 bar 5.What's the unit using in this device? Bar or Psi, the unit could be switched to the one you like.