UPDATE: I've been using this for over a year and it works great! As you can see from the photos I lost some fish BEFORE moving the track monitor into the pond. Every time a crane lands at my pond, it warns me! Now it's only a matter of time that I catch him before he catches more fish like I caught the raccoon that was terrorizing and killing my chickens! I do not recommend this driveway alarm! I plug it into my chicken, which is plugged into a USB power adapter, and it transmits a signal to a receiver about 100 feet away and through a couple of walls. I put it in front of the only entrance to the chicken coop and I'm really surprised that squirrels eat as much as my chickens! I caught a few cats looking for mice and yes I finally saw the raccoons killing my chickens. If I had bought this a year ago it would have paid for itself by rescuing 6 lost chickens. I DON'T LIKE male voices saying your battery is low. It scared me to death the first time I heard it. Also, I don't like that there is a loud high-pitched squeak when changing the volume, which is VERY annoying. Despite those adverts, I highly recommend this as a motion sensor that reliably transmits a signal over a fairly long distance. I'm actually watching another channel and wish I'd bought 2 packs.
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