does not work for me [SEP] when i first got it and put batteries in the lock would not stay in place so the back kept falling out i returned it and had another one sent to me i love the feel of the brush on my scalp but my hair is no less frizzy i hear the hum and know it is working ok it just does not de frizz my hair and the massager part is too light to feel anything good i will not return another one so i just have a plain old brush now