Aetertek At-216w-2 600 Yard Remote Dog Training Shock Collar Classic Dog Trainer Water-resistant Bark Collar for 2 Dogs 15-150lbs Water-resistant dog trainer, pls DO NOT wear this dog collar when swim 4 in 1 function: sleep mode for long battery life, Vibration, Beep and Adjustable 0-7 level Shock Rechargeable dog collar receiver, environmental-friendly use, save much more battery As 2 dogs training system, can be upgraded as 3 dog training if add extra receiver CE,ROHS,FCC Approved. 1 Year warranty