works and seller replaced the defective unit [SEP] definitely zapping some of those course hairs mine does not seem to function the way intended the knob seems to control nothing does not turn it off or change charge seemingly when i hold in my left hand my finger gets zapped a bit but not in my right hand i am thinking it s because i have my apple watch on my left so be sure to remove all jewelry firsti watched a video on you tube first i have red hair and some of my hair is dark at the tip and light at the root plus i have freckles this can make finding the follicle pore challenging however i have removed a lot of these suckers even removed an especially egregious one from my upper lip no more painful than tweezing after i finish my chin will prolly go for the upper lip stash hairsclue that you are in the right spot is when a lot of the white stuff comes out right away definitely a home run one star off for the control knob issuei should have returned it immediately for exchange when i realized it was not working properly but i reached out to the seller and they will replace the defective unit so stars