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① LED 1
When this LED is on, it means the ground-to-air link is connected; when this LED is off, it
means the ground-to-air link is disconnected.
② LED 2
When this LED is on, it means the air-to-ground link is connected; when this LED is off, it
means the air-to-ground link is disconnected.
③ Fan Ventilation Outlet
Don’t block this fan ventilation outlet to ensure effective cooling.