The first use (or replace the battery) need to matching frequency as following:

Step 1. Install two AAA 1.5V batteries (note the positive and negative polarity inside the battery chamber), and finally close the battery cover, indicator will flash three times indicating that the batteries are installed correctly.

Step 2. Press and hold the frequency key(car select) for about 2 seconds and the indicator will flash

Step 3. Turn on the power button of the car and the indicator will turn off

Step 4. If the matching frequency is unsuccessful (indicator can not turn off), please turn off the power supply and repeat steps 2 and 3.