Aetertek AT-216D 600 Yard Remote Dog Training Shock Collar Water-proof with beep vibration 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 and submersible receiver.receivers DC base adopt embedded injection molding process, and equipped with high-precision-waterproof ring with built-in guide slot , ensured waterproof effect over 3 hours underwater 50cm. 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