This is a tire pressure reset instrument. After each tire rotation, tire change, body control module replacement, or tire pressure sensor replacement, the sensor relearn procedure must be performed to ensure accurate tire pressure value acquisition and display. Operation steps: 1. Ensure the vehicle is in TPMS learning state/mode. 2. Follow the vehicle manufacturer’s maintenance procedure. Hold the instrument near each tire in sequence (front left, front right, rear right, rear left), aligning it with the sidewall close to the valve stem (the air filling inlet), then press the reset button. 3. The green LED light (TX light) will illuminate, indicating signal transmission. When the vehicle horn beeps, the matching is successful. 4. Repeat the process for the remaining tires. Specifications: - Compact design for portability and easy handling - Real-time tire pressure monitoring capability - Compatible with most vehicles equipped with TPMS systems - Supports diagnostic sensing function - For GM vehicles with 315 MHz or 433 MHz Tire Pressure Monitoring (TPM) systems, the sensor relearn procedure is required after tire rotation, remote keyless entry receiver module replacement, or tire pressure sensor replacement - Relearn procedure compatible with applicable GM models, including 2014 models - Note: Only designated diagnostic tools can read tire pressure sensor data on 2012 and later model year vehicles Package Included: 1 x Tire Pressure Reset Instrument