Dog training collar 600 yards with waterproof Rechargeable

I just got a new dog, only 10 months old, from a family with small children. As a result, my new lab/boarder collie loves children and wanted to follow them down the road. I love the fact that I can use the tone button as a replacement for "come" and the vibrate mode to warn him. I hate the thought of shocking my dog but even on the low setting he learned quickly. I no longer have to tie him up and he now checks on me every 5 minutes or so, or I remind him with a quick tone. I love this unit and the company stands behind their product. I recommend this product, it's worth every dime.