I have a food dehydrator that looks almost exactly like this.
When set to 105 F it can dry herb in about 10 hrs.
I smoke infrequently, and this can allow same day as harvest edibles.
The food dehydrator allows a temp setting between 90 F and 165 F.
It has a fan that blows up thru the herb from the bottom.
Unfortunately the fan has no speed control.
I'm wondering whether this "MyHerbsNow" device is a re-purposed food dehydrator that runs at low temp and low fan speed.
Does this device blow air up thru the herb, and is it noticeable? I'd guess the food dehydrator blows out a few cubic feet per minute at a few miles per hour.
If we could figure out exactly what this thing does, maybe a food dehydrator used in a unique way could duplicate it, much cheaper.
As an edible maker who cares little about smoke, I now dry under a basement AC/Furnace vent in 3 days.
My vaping friends are fine with it.
Amazon product