Dog No Bark Collar Rechargeable with 4 Training for All Dogs Bark Control Device

I rescued a shelter dog (Donovan) a few months ago. Before letting him roam freely on our property with our other 3 dogs, I walked him on a leash for about 3 weeks whenever we went outside. When I thought Donovan was ready, we would go outside without him on a leash. But the moment I turned my head.. Well let’s just say Donovan was kind of like the dog(s) from the movie Funny Farm with Chevy Chase. Lol Although Donovan would return after an hour or so... I knew that I needed so help with him. I bought this training collar and crossed my fingers it would help keep him on our 4 acres. It only took two separate zaps from the collar and he became a new dog. I am very happy for him that he can roam with my other dogs with no supervision. When he is outside now, after 3 or 4 tries of calling his name, I only use the beep function and he comes a running.