External Sensor TPMS Type: Smart Solar TPMS Car Tire Pressure - Solar Charge, No need to connect car cigarette lighter to charge-Color LCD digital display, clearly display tire information -Real-time monitoring of tire pressure and temperature 4 tires-low air pressure/high temperature alarm-high temperature/air leak/low battery alarm -Intelligent damping start when the car is running, no switch required -Sensor wireless connection is easy to install -Built-in sensor and external sensor options for all your needs -Freescale chip sensor for almost 98% of cars on the market Specifications: Solar rechargeable LCD display mounted on windshield Operating frequency: 433.92MHZ Long-term storage temperature: -30C- +90C Operating voltage: 3.7-5V Working current:6mA USB charging current:250mA Working environment: -30C- +85C Sleep current:4mA Monitoring temperature range: -40C- +130C Product weight: 90g Monitoring air pressure range: 0- 3.5Bar