They do not work, so please don't waste your money. You need to find an electrologist with many years experience, preferably recommended by another person who has had successful electrolysis treatments. They are not easy to find nowadays, as the standard and level of intelligence of your average 19yr old beauty therapist is pretty low. I do know of 2 excellent electrologists but they are of no use to you unless you live in the North West. ie, between Liverpool and Southport.