I already had a receiver and 2 motion sensors when I bought them as an add-on. They work very, very well at varying distances in dense forest. I have 2 design and design issues. The first is the screw-on battery cover on the sensors. It's damn uncomfortable at home, let alone in the woods! How about opening and closing one? Also, the BLACK straps and very cheap buckle they send to attach the sensor are visible from a million miles away and give away the location of the sensor. That is, if you can attach it to anything with a cheap buckle.
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