Ⅰ. The first use (or replace the battery) need to matching frequency 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 indicates that the battery is 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 supply of the car and the indicator will turn off
Step 4. If the matching frequency is unsuccessful (indicator not turn off), please turn off the power supply and repeat steps 2 and 3.