2 in 1 TPMS Tool: Super EL50448 works as both EL-50448 GM series and EL-50449 Ford Series TPMS19 tire sensor reset tool.Wide Vehicle Coverage: tps relearn tool work on most General Motors /Ford/Buick/Cadillac/Chevrolet/GMC/Lincoln/Mercury equipped tpms tire pressure monitor system can be reset.Easy to Use: Super EL-50448 TPMS activation tool with ease, faster operation, activates the in dividual TPMS sensors by pressing one button;How to Use: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.Notice: 1. When using tpms relearn tool GM Ford, please make sure antenna in correct position . 2. And 9V battery should be in good condition.Applicable Models:(Equipped with 315/433 MHz, It won't work if you've purchased aftermarket sensors with wrong frequency.)When you need this tire relearn tool?1. New TPMS sensors installed, letting air out or adding air in to the tire couldn’t make the system recognize new sensors.2. Do tire rotation, didn’t have a quick and easy way to let ECU relearn new tire information.3. When tire pressure indicator light ON, after the maintenance performed, the tire pressure needs to be reset to turn off the TPMS light.4. Low tire pressure or leakage /replacement or installation of tire pressure monitoring equipment / tire replacement, sensor damage, etc. After those problems solved, TPMS needs