NEW UPGRADE VERSION：EL50448 TPMS relearning tool is a must-have tool for tire pressure sensor replacement, tire pressure alarm removal or tire replacement. The upgraded EL50448 is more efficient and escorts your safety. Easy to Use and Operate：Use EL50448 to help you reset all your tires more easily with just 3 simple steps. Make sure the vehicle is in TPMS learn mode and follow maintenance procedures. Hold the tool against the sidewall of the tire near the valve stem. Press the learn button while holding the tool against the tire sidewall. Compatible with Multiple Vehicles：Compatible with most General Motors (Buick/Cadillac/GMC/Opel/Kay Chevrolet, etc., from 2006 to 2022, Sedan, SUV, pickup). Save Time and Money：Our El-50448 has a powerful sensing function to quickly and accurately activate the tire pressure sensor within 1-2 minutes. With our activation reset tool, you don't have to go to the auto repair shop to fix it, saving you valuable time and money. Reminder: 1. When using the TPMS relearning tool, please make sure the 9V battery you are using is in good condition 2. Please make sure the antenna is in the correct position. 3. Different vehicles may take different times to reset all tire sensors after a spin. 4. Sometimes the horn or flashing will give feedback when the tire activation is complete.