This is a hard one to review.i bought this at shoppers drug mart with gift certificates i recieved.does it work? Im still up in the air about it.i like the brush as far as brushing goes.its light weight but im not sure about eliminating frizz.i have very long straight hair on the thinner side that tends to get frizzy alot.i also started a new shampoo and conditioner when i started this with this brush that works fantastic for my hair and its frizz.it has a small sound when turned on,but i have to put my ear to it to hear.so between the new shampoo and conditioner and this brush my hair is doing fantastic.how my much is from the brush? i dont know.i lt takes batteries 2 triple a's.you also have to be careful not to touch the ion part in the middle as there is a stern warning not to but doesnt say why.i assume youll ruin the ion emissions.i have been using this brush for 2 weeks.over all i do like the brush but whether it really works remains to be seen.