Description: This is a tire pressure reset device, or a learning suggestion. After each tire rotation, tire, body control module and tire pressure sensor replacement, the sensor rematching procedure must be performed. Steps: 1. Make sure the car is in TPMS learning status/mode. 2. Follow the vehicle maintenance procedures, hold the instrument in sequence (left front, right front, right rear, left rear), aim it at the tire side wall near the valve stem (inflation port), and press the reset button. 3. At this time, the green LED light (TX light) will light up, indicating that the signal is being sent. When you hear the car beep, the match is successful. 4． Match other tires in turn. Specifications: Compact design makes it lightweight and easy to carry. Check tire pressure in real time. Only certain designated diagnostic tools can read tire pressure sensors on 2012 and later model years. Has diagnostic sensing capabilities. Universal, suitable for most cars. For GM vehicles equipped with a 315 or 433 MHz Tire Pressure Monitoring (TPM) system, a "Sensor Relearn Procedure" must be performed after a tire has been rotated, a remote keyless entry receiver module has been replaced, or a tire pressure sensor has been replaced. This relearning process can be performed using the special tool EL-50448. This procedure also applies to 2014 GM models. Package includes: 1*Tire pressure reset instrument