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I have no objection to these devices; but remember that there's no guarantee that any hostile party/home invader is going to just pull up into your driveway.
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The motion detector type cover more than just the driveway. Ours covers the drive, and the front of the house, including a good part of the yard, to the door. The other sensor covers a good part of the back, including the porch and doors. You really cant get near the house without setting one or the other off.
We also picked up a camera set last winter at Walmart for around $250. It has 4 cameras, and all four sides of the outside of the house are covered, and with some overlap, and the cameras work in the dark as well. Now I dont even have to get up and go look.
Getting the cameras set up and hidden took a little ingenuity, but that was actually a pretty fun challenge.
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My dogs got lazy and waited until they heard the driveway alarm before barking, so I had to turn the chime off and they soon reverted to their old ways
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Ours didnt get lazy, and they still go off at any noise they dont like, they just go even crazier when the alarm sounds. I think the alarm made them insecure and was vying for their job, and they aint letting that happen if they can help it.