Place the magnet on the wall of the garage and the transmitter on the garage door. You may need to rotate the magnet 90 degrees to ensure the arrow still aligns with the transmitter. This configuration should not disrupt the connection, but be sure to test it.
When the garage door opens, the transmitter will slide straight up with the garage door, away from the magnet. It should report “Open.” When the garage door closes, the transmitter will slide straight down back in place next to the magnet. It should report “Closed.”