The Ride-On LED Smart Cap Tire Pressure Monitor valve cap is a must for people that want to make sure that their tires are properly inflated. For case order quantity 12. Once installed, the LED Smart Cap will alert you if the tire pressure drops by a setpoint pressure. The bright red blinking LED light will continue to warn you of low tire pressure for more than a month. Great compliment to Ride-On TPS Tire Sealant & Balancer. The Ride-On LED Smart Cap is easy to install and automatically calibrates to the pressure of each individual tire.