Aetertek AT-216D Waterproof 600 Yards 550m Range Remote Control 3 Dog Training Anti Bark Shock Collar Beep and Vibration Can be used as 1 dog,2-dog or 3-dog remote dog training shock collars system (This listing is for 3 dogs with 3 receivers) Dog training collar with Vibration, Beep tone, 0-7 adjustable levels of Shock correction mode Rechargeable 100% waterproof collar receiver, you dog will be happy to have it for swimming Remote control dog trainer range up to 600yards (approx. 550 meters) for all dog size from 15-150lbs CE,ROHS,FCC,RTTE Approved.1 Year manufacturer warranty