Electronics Collar One-Stop for Medium-Sized Dogs (^^) Product Description: This collar reacts to a dog's barking with electric shocks after three or more consecutive barks. By repeating this, the dog learns that barking results in a shock. Precautions: This product is a dog training collar that uses electric shocks from dry cell batteries. Please be sure to follow the items below: 1. Do not use it for anything other than dog training. 2. Do not use it on dogs with heart problems, puppies under 6 months old, pregnant dogs, obese dogs, or elderly dogs. 3. Do not use it on extremely timid dogs or easily excitable dogs. 4. Do not use it for more than 8 hours a day. 5. Do not store it where children or pets can see it. 6. Do not use batteries other than the specified ones. (9V manganese battery specified) *Since the operation has not been confirmed, it is sold as a collectible item. Please use with caution. Shipping will be on weekends due to a business trip m(_ _)m Dog supplies, pets, Labrador, large dogs, medium and small dogs