They were installed correctly, the unit that was placed next to the mailbox near the road watching the driveway works if the car is pulling in close enough to put mail in the mailbox but not if it's in the center of the driveway which is 3 ft further away from the mailbox then the mailman drives. I can walk next to the one at the front door and if I wave my hand within feet of it it will go off but not if I'm more than three feet away. Just junk
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