Note:The package does not include the charger and battery. Features: EL-50448 tpms reset tool can help you reprogram all tires much easier just with 3 steps.Tire pressure monitor sensor activation tool is simple, fast and easy to use, activates the individual TPM sensor with the press of one buttonAn essential tool of replacement tire pressure sensor, tire pressure alarm remove or exchange tires.Works on most General Motors (Chevy/Buick/GMC/Opel) equipped with 315 or 433 MHz Tire Pressure Monitor system (TPMS) sensor. How to Use: Ensure that the vehicle is in the TPMS Learn Mode, and follow the service procedure. Hold tool against the sidewall of the tire, near the valve stem. Depress Learn button while holding the tool against the tire sidewall. For Different vehicle EL50448 may need different times to reset all of your tire sensors after rotation. Packing List:1 x EL-50448 Tool Notice: 1. When using EL50448, please make sure antenna in correct position. 2. Please make sure the 9v battery in good con.