This is a tire pressure reset device, or in other words, a learning device. After each tire rotation, tire, body control module, and tire pressure sensor replacement, the sensor re matching program must be performed to the accuracy of tire pressure value acquisition and display. Operation steps: 1. that the car is in TPMS learning state/mode. 2. Follow the car maintenance procedure, hold the instrument in sequence (left front, right front, right rear, left rear), align it with the tire sidewall near the valve stem, and the green reset button. 3. At this time, the green LED light (TX light) light up, indicating that the signal is being transmitted. When you hear the car beep sound, it means that the matching is successful. 4. Match the other tires in sequence, and the product flash continuously to complete the matching of 4 tires at once. After successful matching, the red power button to turn off the power Applicable models:for , for , for Colour:Orange Material:ABS Package Contents: 1 * Car EL-50448 II Tire Pressure Reset Activation Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.