We have 2 of these sets in our possession. One for our house and one for our shop on the same property. The one by the house lets us know in one tone when someone walks through the front gate and in a different tone when they walk into the business part of the house. If we don't hear the second tone, we know it's home delivery or a guest. When we hear a second beep, we know they're on their way to the office. In the business center, the first horn sounds as they pass through the office gate, and then the second horn as they pull into the parking lot. Since both places are big, we can't always see a car coming towards us, so it's really helpful. I would absolutely recommend them. They are easy to assemble and weatherproof. You can mount them on trees or poles.
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