Bluetooth remote control instructions The first use (or when replacing the battery) requires frequency matching Step 1. Install two AAA 1.5V batteries, observing the correct polarity as marked inside the battery compartment, then close the battery cover. The indicator will flash three times to confirm correct battery installation. Step 2. Press and hold the frequency key (car select) for approximately 2 seconds until the indicator begins to flash. Step 3. Turn on the power supply of the car; the indicator will turn off. Step 4. If frequency matching fails (indicator does not turn off), 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