Bluetooth remote control instructions. When using for the first time (or replacing the battery), frequency matching is required Step 1. Install two AAA 1.5V batteries (pay attention to the positive and negative polarity inside the battery compartment) and finally close the battery cover, the indicator will flash three times, indicating that the battery is installed correctly. Step 2. Press and hold the frequency button (car selection) for about 2 seconds and the indicator will flash Step 3. Turn on the car power supply and the indicator will go out Step 4. If the frequency matching fails (the indicator does not go out), turn off the power supply and repeat steps 2 and 3. RX23 replaces RX18 and RX7 RX19 replaces RX12 RX71 replaces RX37 RX74 replaces RX30