Features: Real time Monitor Vehicle Sensors Tire Pressure can improve fuel efficiency, prolong tire life, increase traffic safety and monitor temperature. Visual and sound warning LCD displays Vehicle Sensors Tire Pressure and temperature Wireless connect by s, easy install Solar charging,dont need to connect car cigarette lighter to charge USB charging available,no worried when rainy day or night time. Specifications: Color: Black IP: IP67 Display Units: Bar, Psi Size: as the pictures Material: Plastic, metal Working Frequency: 433.92MHz Working Temp.: -40~125 C Receiver Working Temp.: -20 ~ 70C Working Pressure: 0~51 Psi/0~ 3.5 Bar Receiver charging method: USB, Solar energy Working Voltage: : 2.0-3.6V; Receiver: 5V 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 (long press the left button for three seconds to turn on and off) It is recommended to use a mobile phone charger or car charger to charge the new machine for 1 hour before using the new machine During normal use, when you open the door before getting on the car and start the car, the host (TPMS) will automatically wake up the screen when it receives a sense of vibration. After getting off the car, the host (TPMS) will automatically turn off the screen and enter the parking dormant state after the car is stationary for about ten minutes Package Included: Internal: 1 x Solar powered Monitor 4 x Internal 1x USB cable 1x Manual 1 x Double-sided tape External: 1 x Solar powered Monitor 4 x External 4 x Lock Nut 1 x USB cable 1 x Manual 1 x Installation tool 1 x Double-sided tape