Harbor freight sells a motion detector that is made to put in the drive way and let you know when someone drives up. I think a better use is in the garage. if placed inside the door it sends an alarm (like a irritating door bell to the indoor sensor) that goes off if anyone walks in or opens the door. While I try to never leave it open I am human. There is always a coupon for it. At black Friday they were $10 bucks but last week the best coupon was $14
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