1. Features: The EL - 50448 tire pressure monitoring system reset tool can assist in reprogramming all tires more easily in about three steps. The tire pressure monitoring sensor activation tool is simple, fast and user - friendly. One can activate a single tire pressure monitoring (TPM) sensor by pressing one button. It is a useful tool when replacing tire pressure sensors, eliminating tire pressure alarms or changing tires. This tool is suitable for many General Motors vehicles (Chevrolet, Buick, GMC, Opel) equipped with 315 or 433 MHz tire pressure monitoring system (TPMS) sensors. 2. How to use: - Make sure the vehicle is in the tire pressure monitoring system learning mode and follow the maintenance procedures. - Place the tool against the tire sidewall near the valve stem. - Press the learning button when the tool is against the tire sidewall. 3. For different vehicles, the EL50448 may take varying times to reset all tire sensors after tire rotation. 4. Precautions: - When using the EL50448, ensure the antenna is in the proper position. - Make sure the 9 - volt battery is in good working condition. 5. How to use - Step 1 - Enter the learning mode: Set the shift lever to... (The original text is incomplete here)