1/3 oz. sensors replace the screw on stem cap, requiring no tire re-balancing and have a patented anti-theft lock that prevents the sensors from being accidentally lost. Enhanced sensors offer faster and better transmitting time on pressure and temperature changes, while providing continuous transmitting when in motion. Unique G-force sensing recognizes movement allowing the sensors to save battery power when parked and come alive once moved. Easy to install in less than three minutes with no tools required.