I've started a small apple orchard (real small 4-5 trees).
Problem is these trees attract bears when the apples start to get close to picking time.
I lost 1/2 of a tree last year to a bear when it tried to climb the 4 foot high tree.
I have a bushnell trail cam that I set up to photograph the culprit but that wouldn't discourage it.
I needed an alert to help me catch it before it could do anymore damage.
I orignaly thought I'd use one of my many unused MS10A security Motion sensors.
I set one up and armed my DS7000 I figured I'd use the MS10a thinking it would allow me the range I needed.
It did work but hearing the alarm at 3 in the morning was a bit to much to get me out of bed as it woke everyone else. Not to mention finding a key flob or remote to unarm at that time of day isn't easy either.
I had a few MS14As laying around and a UM506 (universal module).
I attached the sensor to a wooden stake which I was able to move arround to find a sweet spot and repositioned my CM15A so the motion sensor was in range.
I set the UM506 to sound only and continuous (not sure if a momentary trigger would be enough to wake me).
I have a strong spot light which I can shine on the trees and usualy it and a bit of noise will scare off any thing.
The bear hasn't been back since setting this up but I have been woke up by a doe and it's two fawns.(yep they love the apples to but usualy don't do to much damage).
during the day time hours I usualy unplug the UM506 as the ms14a sends lots of false trips with the warm sun on the trees leaves and a small breeze.
I have a crossbow handy as well but this one seems to know I can't use it at night.
One Day it will slip up and come out during daylight hours.