Ride-On LED Smart Caps are the easiest TPMS(Tire Pressure Monitoring System) to install on your tire valve stems The LED Smart Caps automatically calibrate to the pressure in the tire and set itself when the cap are installed This TPMS cap can be used with tires from 10 psi to 70 psi Automatically compensates for ambient temperature changes to avoid false alarms Comes with integrated anti-theft device Ride-On TPMS LED Smart Caps blink red to alert of low pressure for up to 750 hours Low battery alarm - the LED Smart Caps will blink yellow for up to 100 hours to alert you that the batteries are running low Bright blinking LED light that is visible in daylight and night time Proper tire inflation pressure helps not only extends tire life but also optimizes fuel economy and saves up to 3% in fuel The purchase of Ride-On LED Smart Caps entitles you to a free 1 year membership to Ride-On's exclusive road side assistance program (Online registration required at http://www.ride-on.com/led-smart-cap-roadside-assistance.html)