The Tire Pressure Monitoring System (TPMS) measures the pressure inside a tire directly, transmits the reading and displays it. The driver is alerted of a critical situation by means of a corresponding signal.
The TPMS takes the reading directly on the wheel. Battery-fed sensors mounted on the rim and integrated into the valve measure the tire's inflation pressure and send a high-frequency signal with coded information to a receiver. Special software in the control device then processes the data received and shows it on a display on the instrument panel.