Seen and used on many older garage door openers but still available are the jamb key switches. A hole is drilled into the outside side jamb of the garage door opening where the jamb key switch is mounted. Two wires are attached to the jamb key switch and fed through the jamb and back to the garage door opener where they are connected. When the key is turned it sends a signal to the garage door opener to open or close the garage door.
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