I have one of these... I bought it like 5 years ago and never used it. I pulled it out the other day and put a 9V battery in it and it worked so I brushed my Dexter with it. He was actually amazing with it... normally brushing him is an ordeal we both dread. He turns from my sweet 6lb little boy into a 600lb tiger with 14 legs! With this brush he was amazingly calm and his mats slid out of his hair. It did have a strong smell like static and honestly I have no idea if it helped his smell at all... but the mats coming out so easily was amazing. I'm doing some research on it now and am reading that they are unsafe to use since noone should breathe in that ozone ... I had no idea.
