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Title: Junk!
Review: I don't understand why it's hit or miss with these motion sensors. I've installed 4 of these in 2 different rooms and sometimes they work and sometimes they don't. One didn't work for a few months then all of a sudden it worked 90% of the time. It does need to be grounded which can be accomplished by attaching the grounding wire to the box with a self tapping screw. I would hold off on motion sensors until the technology gets better especially at this price point.
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