You may follow the steps below to insert a micro SD card into RLC-422/RLC-422W/842A/RLC-542WA.
Note: Before installing/uninstalling the SD card, power off the camera first, in case that it will damage the SD card.
Here is a video for your reference:
Step 1. Remove the antennas (If your camera is RLC-422, please skip this step). Use a wrench to loosen the three screws on the dome cover, then take the dome cover off.
Step 2. Insert the micro SD card into the SD card slot.
Note: Please pay attention to the direction of the micro SD card when you insert it (Refer to the picture below).
Step 3. Put the dome cover back and screw the screws tightly, then mount the antennas.