There is a film on the receiver of this product, please tear off the film before use! Jansite Cigarette Lighter Digital TPMS Car Tire Preure-Real time monitoring tire preure and temperature -Tire leaking warning and temperature balance -The display can be directly plugged into cigarette lighter -Beeping alarm and display the alarm value -Can support four tires, tire position can swap -Visual and audible warning for abnormal preure and temperature -Two units (PSI / Bar) changeable, you can set the one you like. -External sensorscanchange the battery, Internal sensorscan'tchange the battery. Real-time Monitoring and Warning of Battery VoltageDisplay the voltage of the battery in the car to help you know if there is any abnormality in the car battery, to expand and protect the battery life of the battery. Suitable for many kinds of cars Suitable for Cars, ORV, SUV, MPV, Minibus, Wagon, etc.