TPMS Relearn Tool Usage: 1. Need 1x Pcs 9V battery to work(not included) 2. Set the car in TPMS learning mode. (car horns twice) 3. Starting from the left front tire, the antenna of the dedicated tool for tire pressure monitoring is facing upwards against the tire sidewall near the rim of the valve stem to start the antenna. Press and release the button and wait for the speaker to emit a .Once the speaker is chirping, the sensor information is read and the turn signal to be read at position will light. 4. Follow this order to rest TPMS one by one: Front left, front right, rear right, rear left. 5. After all sensors reset, the car horns twice, the TPMS re-learn finished. How to switch between: Hold the power button for 3 seconds and 2 flashing 2 times, LED flashing 2 times. If the Green LED flashing, means TPMS relearn tool in mode, if the Red LED flashing, means TPMS relearn tool in for mode. Suitable: For series (for Opel / for / for / for / for ) and for series (for / for Mercury). Material: ABS colour: blackandorange Package Contents: 1 x TPMS Relearn 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.