it does not work do not buy it [SEP] worst invention ever this got returned to amazon after trying it the attachment part has to be forcefully stretched over hair dryer nosel it pops off a lot and the silicon gets so hot that you cannot even try to put back on until it cools down the worst is that it collapses as you try to use it seriously it has no weight to the product so cannot use on roots scalp it is just completely worthless