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The rain cover on the OP is cool and not certain how the heat detection works, but it sounds good. The transmitters on either the HF or the OP light up on detection.... but to stay anonymous at night, I cover that light on the HF with a piece of black electrical tape. For this OP unit, the detection light is in the sensor and you cannot cover it.
A good price for three, I almost purchased the OP to have around, like in a couple spots inside the shop, or maybe for the distance, but I still like one receiver for one transmitter and the ability to keep anonymous in the dark. Like in the OP video, I am not carrying the receiver to the bathroom, but will hang one of the HF in the hall that on high, I can hear all over the house for the entrance door.
https://www.amazon.com/Mighty-Mul...B003765W0
Otherwise with all the deer near me, it would be basically useless (for my purposes), as they would set it off a dozen times a day. I ended up buying a second base station so I could have one on each side of the house. If they are set to the same channel, the one sensor activates both stations. Downside of the magnetic style is it won't detect people but in the country that is less of issue than in the city.
Now this deal's motion detector style would be great for alerting of pool access if you had small children, blind alleys next to a house, rear doors that normally went unused, etc. But unless you have no deer, no trees / bushes that sway in the wind, etc I cannot imagine this style being anymore than a nuisance (in the country at least) which goes off all day and all night to the point you tune it out.
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Audible so i go look at the visuals
Also.... I just wanted to say DAMN MAN! YOUR UNCLE TOOK THE THOUGHT RIGHT OUT OF MY HEAD! not 120v, but more like 12VDC lol... enough to give their peepee a JOLT rather... don't wanna be doing https://static.slickdealscdn.com/ima...ies2/digin.gif
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All in all, motion sensors WITH cameras to verify are quite practical if you don't have an issue with confronting whatever is trespassing. What I don't like about the OP motion sensors only, is the red light that comes on and unlike the HF model, you cannot tape it off... which gives away it's location. A human intruder will avoid, remove, or cover it and wait awhile.