These are the best collars out there. I have been a dog trainer/behaviourist for over 45 years. I get the dogs that the other trainers can't handle. These collars, used correctly, will not let a dog slip out and run away. These collars, used correctly, will get your dogs attention when you want and then you can give them the love & treats they so richly deserve. I am angry that they are being banned by so many pet stores because the public thinks they are inhumane. I think the public needs to be educated and maybe if more dogs were trained the correct way they would not wind up in shelters because of bad behaviour. These collars, in my professional 45 years of experience, are the best.