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If I had anticipated I would want an alarm, I would have made a provision for hard wiring. I tried the HF sensor, & it worked out OK. I still use one for the small road below my house leading to my sheds & rear parking area. The sensor is painted camouflage and mounted on a tree limb pointing down to the road with the receiver mounted under the eave of my shed. This is mostly to scare anyone coming up the road. I ended up with a Chamberlain driveway alarm (do a search - around $60). I also painted the sensor camouflage and mounted it beside the entrance to the driveway. The receiver is mounted on the back of a side table next to a couch. I've had it for maybe five years & if it dies, it's not expensive to replace & serves the purpose if you just need something to notify you about movement on the driveway/path. One thing is you have to adjust the sensor (of anything like this) according to it's area of detection if you don't want constant false alarms. Also, I get alarms when squirrels, turkeys, birds, etc. move across the front of it. Over all I'm happy with it.
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Marv Evans
'69 911E
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