Aetertek At-215C Dog Training Shock Collar Rechargeable Submersible E-collar with Safe Vibration and Shock 550M Upgraded version dog training collar, new technology for syncing, much more user friendly and durable The most advanced submersible level, you dog can swim with it 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. Factory sell with 6 months quality warranty