Please note!!! When you receive the package and turn on the receiver, the receiver displays "--" or "00", please don't worry.You only need to mount the sensor on the tire, wait for about 1 minute, and you will see the display shows the preure and temperature of the tire. Type: Vtopek TPMS Car Tire Preure -The display can be directly plugged into cigarette lighter-Color LCD digital display, clearly showing tire information-Low air preure/high temperature alarm-Real-time monitoring of the preure and temperature of 4 tires-This sensor is connected wirelely, easy to installBuilt-in sensors and external sensors are optional to meet your needs-Two units (PSI / Bar) changeable, you can set the one you like. Suitable for most car Suitable for cars, ORVs, SUVs, MPVs, minibuses, station wagons, etc. Built-in + external sensor optional