The sensors of this theft-proof monitoring system working for a tyre pressure of up to 6.3 bar are simply put on the valve instead of the usual caps. The measured values are transferred via Bluetooth to the free easydriver app. If need be, 2 or 3 sensor sets can be used simultaneously. Set content: 2 sensors. Operating temperature -20 °C - +85 °C. Weight: approx. 9.5 g per sensor.