Aetertek 215C Waterproof Pet Dog E-collar Shock Collar Training System Stop Bark Tool 550M Remote Range Aetertek classic model,very easy to use,fit for beginners or the elderly. Can be used as 1 dog or 2 dogs remote dog training collar at the same time or separately 100% waterproof and rechargeable collars Electric remote range up to 550M. 2 Levels of shocks and vibrations(low or high)