Any dog owner may train their dog to be independent outside in just a few days using this collar.Training aid – The collar fits your dog comfortably and has enough of breathing capacity. It has sensitivity settings ranging from 1 to 7.Rechargeable Bark Collar – This bark collar can be fully recharged with the help of the USB cable that is provided, and a full charge will last up to 10 days. (Seller’s Note: Open Box)