10 Tire RV Cap Sensor Tire Pressure Monitoring System (TPMS) Tire sensor with replaceable battery can be secured to prevent loss or theft Portable monitor has rechargeable battery and monitors tire pressure 0-199 PSI & temperature Monitor tires 24/7: low/high pressure, high temperature, and slow leaks. Monitor warning thresholds are user adjustable; low pressure alert level is per axle adjustable. Tire sensor signals have excellent range and not require signal booster for most vehicles