Electronic Dog Collars

So the other day I bought a Electric Collar for my yellow lab. I didn't get it to train him anything new, i got it to reinforce the stuff he already new. When i first put it on him he didn't understand what the beeping noise meant or where the shocking feeling was coming from. As the days went by he started to understand what everything meant and now I don't even have to turn it on or put it on him and he listen a whole heck of alot better. So i was visiting my grandparents the other day and i had him with me and he had his collar on him. When grandpa asked what that was i told him he got mad and took it off of him. So i guess my point is, whats your opinion on the Electronic Collars? Are they inhuman or no?

-Dylan Barber