Features: Real time Monitor tire preure can improve fuel efficiency, prolong tire life, increase traffic safety and monitor temperature. Visual and sound warning LCD displays tire preure and temperature Wirele connect by sensors, easy install Solar charging,don't need to connect car cigarette lighter to charge USB charging available,no worried when rainy day or night time. Specifications: Color: Black Sensor IP: IP67 Display Units: Bar, Psi Size: as the pictures Material: Plastic, metal Working Frequency: 433.92MHz Sensor Working Temp.: -40~125 C Receiver Working Temp.: -20 ~ 70C Working Preure: 0~51 Psi/0~ 3.5 Bar Receiver charging method: USB, Solar energy Working Voltage: Sensor: 2.0-3.6V; Receiver: 5V Sensor Battery: Built-in CR2050 button battery Receiver Battery: Built-in 400m Ah polymer lithium battery Tips: The host (TPMS) must be turned on before installing the sensor (