I would not want a motion detector sensor. Too many false alarms.
I looked for the light beam type to put at the gate, but never got one.
This type would be my second choice: Wireless Driveway Alarm by Mighty Mule - FM231
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For now we are using our dog and his super sensitive hearing.![]()
Im using this one @300 feet and so far so good 2+ years. Occasionally it misses cars driving in to fast. It also tends to pick up school busses and tanker trucks driving past my driveway as false positives. At $80 on sale it was the cheapest thing I could find. Id buy one again.