Size: GM 2019 Updated GL-50448 Equipped with a round antenna and Switch button, let Open Signal Faster and Stronger than other TPMS Relearn Tool. also More sensitive and Suitable for your fingers operation. WIDE VEHICLE COVERAGE VXDAS GL-50448 works on General Motors (Chevy/Buick/GMC/Opel/Cadillac) equipped with Tire Pressure Monitor system (TPMS) sensor EASY To USE Sensitive sensor, Circuit Optimal Design, Easy to use, Activates the individual TPMS sensor with the press of one button. Ensure that the vehicle is in the relearn mode, and following the service procedure. Hold tool against the sidewall of the tire, near the valve stem. Depress press button while holding the tool against the tire sidewall. FRIENDLY TIPS 1. When using tpms relearn tool, please make sure antenna in correct position 2. And 9V battery should be in good condition, 3. When activation of a tire is finished, sometimes the horn or flashing will feedback.