Waterproof&rechargeable dog training collar for 3 dogs

my sister bought one for my mother who was given a Pomeranian puppy who would not stop barking. a trainer said "it's just that sort of dog" took her money and left the problem. this collar used sparingly worked wonderfully well . now all she does is wave it at the dog and he stops barking but he still lets her know if there is a problem around the house or outside. I would heartily recommend this item as a soft harmless training tool.