I asked my vet about them on my cows. He said he could treat them every week and they would clear up in about 8 weeks, or just ignore them and they would be gone all by themselves in about 2 months.
My neighbor went thru the research for this last year and got the Spartan. Works great, and the batteries last a long time.
I was dialed into it for a while, and had to quit. Kept getting pics all the time of all the deer, turkeys, bobcats, etc walking by. Made me want to stop what I was...