Here is the thread on BYC regarding the collars (and other devices people have tried!) https://www.backyardchickens.com/t/820771/sound-of-silence-6am-no-more-crowing
I got my rooster collar from this lady www.facebook.com/roostercollars
The collar works well for my rooster. He can crow but it's nowhere near as loud. I bring him inside at night and he stays in the laundry (because he starts crowing at 6.30am) and he gets let out between 7 and 8am. He's a lovely rooster, I'm so glad I didn't give him up!
I got my rooster collar from this lady www.facebook.com/roostercollars
The collar works well for my rooster. He can crow but it's nowhere near as loud. I bring him inside at night and he stays in the laundry (because he starts crowing at 6.30am) and he gets let out between 7 and 8am. He's a lovely rooster, I'm so glad I didn't give him up!