Aetertek AT-216D Rechargeable 600 Yard Remote Pet Dog Trainer Dog Training Electric Shock Collar Water-resistant For 3 Dogs Can be used as 1 dog,2-dog or 3-dog remote dog training shock collars system (This listing is for 3 dogs with only 3 receivers) Dog training collar with Vibration, Shock and Beep tone correction mode.0-7 adjustable levels for shock correction Rechargeable water-resistant(not waterproof) receiver, pls DO NOT wear this when swim Remote range up to 600 yard (approx. 550 meter), suitable for all dog size from 15-150lbs CE,ROHS,FCC,RTTE Approved.1 Year manufacturer warranty