I purchased this product to help reinforce off-leash training with a 23kg 1.5yr old husky-lab mix. She had a few problem behaviours I needed to curb like chasing after other dogs and children, but was more playful than she was stubborn. After the first day of training, I no longer need to use the continuous function; the beep and nick suffices and often only the beep. Further, power 2 is enough to achieve results. Using the 3rd power level caused her to yelp. I had to trim fur from two spots under her neck since she has a thick coat to get a consistent contact with the electrodes. The only drawback is that it has to be on quite tight to prevent the electrodes from migrating around her neck when she shakes her head. I haven't yet had a chance to evaluate the waterproof claim though it performs fine in snow.