Once installed the LED TPMS valve cap will alert you if the tire pressure drops by a set point pressure. The Light Vehicle version of the LED Tire Pressure Monitor System is available for automobiles, SUVs, light trucks, vans, motorcycles, scooters, trailers, ATVs, etc. with a pressure range of 10 to 70 psi and a low pressure warning trigger of 4 psi (with a +/- 10% accuracy). The Heavy Duty professional grade LED TPMS for fleets and commercial applications is available with a 4 or 8 psi low pressure flashing LED light alarm trigger, and is suitable for pressure ranges from 30 to 170 psi. The bright red blinking led light will continue to warn you of low tire pressure for more than a month.