Aetertek At-216s-1 Submersible Dog Trainer 550m (600 Yards ) Remote Control Shock Collar Pet Dog Electric Shock Trainer Control 1 Dog Training No Bark Shock Collar, Rechargeable Dog Bark Collar Receiver Aetertek 216D one dog shock training collar. Rechargeable and submersible (100% waterproof) dog trainer, can be immersed in water when your dog is swimming As 1 dog training collar, can be upgraded as 2 or 3 dogs training system if add extra receivers Classic Dog training collar with professional and safe correction mode: Strong Vibration, 0-7 adjustable levels of Shock, Beep tone correction mode Remote control dog trainer, up to 600yards (approx. 550 meters), suitable for small to large dog size from 15-150lbs Aetertek brand carry and go bag, very convenient package. 1 year warranty