Solar Wireless TPMS Car Tire Tyre Pressure Monitoring System + 4 External SensorsDescriptionSolar Power Vehicle Car Tire Tyre Pressure Monitoring System Wireless Auto TPMS Alarm Warning With 4 Sensors BAR PSI LCD Display. Solar Powered, Wireless ,Working pressure: 0-5BAR Please note before buying:1. The Solar Power is Accessorial Charging which extend the receiver to works 5 to 15 days. You need to charge the receiver by USB if receiver is out of power.2. Sometimes the receiver can not receive the signal from the sensors. That means you need to re-matching thecodes from sensor, please contact us to know how to do, it takes 2 minutes, thanks.​Pleas note:The package list DOES NOT include car charger. If you need a good car charger, please click HERE: Packing list as below:1x TPMS ALARM main unit4x external sensorssome screws and wrench 1x users manual.1x usb cable( for charging it cigarete light power 12V by using car charger) Feature• 4pcs Internal TPMS Used for 12V power cars• Display pressure and temperature of each tire simultaneously• Real-time monitoring tire pressure and temperature • High / low pressure,High temperature warning • Wireless data transmission and interference sensor Sensor SpecificationsBattery life: >5 yearsWorking voltage: 2.1V-3.6VStorage temperature: -45°C-125°CWorking temperature: -40°C-120°CTemperature accuracy: ±2°C (25)°CWorking pressure: 0-5BARIP: IP67Transmit power: