Aetertek AT-215 600 Yard Remote 1 Dog Pet System Vibration Electric Shock Training Collar As 1 dog remote dog training collar system( can be upgraded as 2 dogs training if add extra receiver) Rechargeable and water-resistant(not waterproof) receiver, pls DO NOT wear this trainer when swim Strong shock + weak shock + strong vibration to get your dog's attention, suitable for dogs from 15 to 150 pounds Solid remote control to 600 yards550mand signal can pass through walls and fences CE,ROHS,FCC Approved. 1 Year quality warranty