Installation TIP Please turn on the monitor first and then install the 4 sensors. Turn on/off ?Solar Power TPMS -- Long press the left button. Sensor Installation (FL--Front Left, FR--Front Right, RR--Rear Right, RL--Rear Left) 1.Detach off tire and deflate 2.Loosen the tire and remove the original air valve 3.Install the internal sensor 4.Inflate the tire to standard pressure 5.Take the balance running test and make sure it works well 6.refit tire to the vehicle. After the sensors are installed, When the driving speed is up to 9mph or 15kph, the display will update the data of tire pressure automatically. Specification 1.Sensor working voltage: 2 - 3.6V 2.Display working voltage: 3.5 - 5V 3.Optional pressure units: Psi / Bar 4.Optional temperature units: Deg.C, Deg.F 5.Operating frequency: 433.92MHz + / - 20KHz 6.Sensor working temperature: -40 Deg.C - 125 Deg.C 7.Monitoring temperature scope: -40 Deg.C - 125Deg.C 8.Monitoring pressure scope: 0 - 6 Bar 9.Pressure accuracy: 0.1bar. Package include 1 x Monitor 4 x Internal Sensor 1 x Anti-slip sticky mat 1 x instruction manual