Great for all of your portable doors.
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I’m gonna buy one and make people ring it if they want me to talk to them.
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I think it is for mobile homes 
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Largely duplicates (but somewhat disrupts) having a RING doorbell… my wife would “look” at me, like “make up your mind, again”…
Years ago when we could keep our garage door open without things being stolen, we used on of these on the garage door bc neighbors would come in that way.