Waterproof Dog E-Collar Trainer with remote Rechargeable E-Collar for 2 Dogs

This is the first time I had to use a training tool like this. The instructions were easy to follow and the training manual made it even easier to understand in the dues and don'ts of how it works. My German Shepherd puppy who weighs 70+ pounds definitely understands now when I say "no"!!!. I would definitely recommend this product as a tool to train your stubborn puppy/dog. I would rate this product five stars out of five. :-)