The PetSafe® Big Dog Remote Training Collar is an easy and safe way to train your dog off-leash. You can use the remote trainer to teach your dog new commands and stop bad behavior. Simply press a button and your dog will receive a harmless, but annoying static correction that gets your dog’s attention. With 16 levels to choose from, you can be sure to find just the right level for your dog. Features 100 Yard Range - Great for indoors and smaller outdoor spaces 16 Adjustable Levels - Static stimulation and 1 tone (beep) level to teach commands and correct behavior Boost Button - For situations where you need your pet to "stop now" Waterproof Collar - For all of your dog's outdoor activities Batteries Included - System requires four PetSafe's RFA-35-11 batteries For Medium and Large Dogs - Designed for dogs over 40 lb; fits neck sizes up to 28 inches