The Premier Pet 300 Yard Trainer helps you correct unwanted behaviors in your dog, small or large, by allowing you to communicate and effectively enforce the rules in a way that is easy for your dog to understand. By pressing the clearly labeled buttons on the handheld remote, you can customize to your dog's needs with 3 safe modes of training corrections: 1 tone, 1 vibration, 99 levels of static stimulation. The included rechargeable, waterproof training collar has a nylon strap that is adjustable up to 28", making it a great fit for both smaller and larger dogs. A low battery indicator on the collar will alert you when the collar battery should be replaced. This system can be expanded, providing an effective training tool for up to two dogs using the same remote (extra collar available through Customer Care). Whether it's your first-time dog training or you have much experience, the Premier Pet 300 Yard Trainer will provide you with an easy-to-use design that is ideal for training indoors or in your backyard!