I hate to purloin from a Sesame Street song, but:
"There's a funny farm down the road from me where the silliest thing happen that you ever did see.
Way late at night, when everything's dark, five dogs (cluck). Five hens begin to (bark)."
And anytime of day or night you'll be surprised to hear, a boom-ing canon, to chase away the deer.
I have researched the use of noise deterrents and deer and they have concluded that deer soon become accustomed to the sound and totally ignore it...as in deer on runways with roaring jet noise. PARTNER and I are not made of such stern stuff. We are annoyed during the day and kept awake at night by the blasts emanating less than an acre away. I guess Mr. Farmer didn't read the directions..."Do not use around residences." Or, maybe he thought since he didn't live in the area, it wouldn't be a problem.
Most of these devices run off a propane cylinder. Because we are under severe fire warnings, I'm hoping we are not about to be incinerated in the night by a flying spark. Even if this thing is run off of electricity, it is nasty nuisance. So much for the peace and quiet of the country.