No, it isn't like a bark collar - no shocking or anything. It is made of mesh and velcro and fits snugly around the neck and puts pressure to limit the force of air so the crow isn't as loud. They can still crow, just not as loud. Apparently our little Tractor just gave up trying since he couldn't crow as loud. He could still eat and drink while wearing it. Granted, he hates having it on. He tries to back out of it and flip out of it and pitches a general hissy fit for about 10 minutes then settles down. Another couple of nights and I won't use it again. I really wanted to see if worked so I could have the option available if we needed it - like if my daughter is sick and I don't want her disturbed. It is an interesting concept. There's pictures of the collar and of it being worn on the website http://nocrowroostercollars.com/ I consider my little experiment with it successful and my curiosity satisfied.How does it work? Is it like the bark collar for dogs?I don't need one I am just curious.