The TP-S3 tyre pressure monitoring system for passenger cars derives its value from four light and very small external valve cap sensors. The LED displays the tyre pressure and temperature of all four tyres simultaneously. The threshold values of the alarm can be set; the system informs the driver visually and acoustically about deviations from the set required values. Energy for the TP-S3 can be provided via a micro-USB connection or the built-in, efficient solar panel. The system can be mounted freely on the dashboard.