Our caravan hub and wheel bearing sensors are a great safety addition to your iCheckTPMS. The team at iCheck have spent many months and countless hours developing the world’s first TPMS capable of monitoring the hub and wheel bearing temperatures on your caravan. Working in a similar fashion to the TPMS wheel sensors, the bearing sensors send a wireless signal to the monitor inside your car giving real-time bearing temperatures with visual and audible alarm notifications. Please note: The bearing temperature sensor is only compatible if your existing Monitor says “NEXTGEN” (check underneath the monitor). Working temperature: 30℃-93℃. Input voltage/current: DV 3V. Frequency: 433.92 MHz. Transmission power: <10dBm. Temperature accuracy: +/- 3℃. Size (LxWxH): 30x24x15mm. Weight: 11g. Battery life: 18-24 months. Replacable battery: NO.