Two are "surprising":
1) It should shave before!
2) Do not work depending on your type of hair (including dark skin, white hair ....)
and as already stated, he "pluck" not literally but "grid" the hair root and this is why it is necessary to shave before so that the "pulsed light" reaches up the bulb of the hair.
But once all the caveats taken into effect, its use remains extremely simple. The intensity is determined based on your skin color and hair and just apply the epilator to the area to treat. A feeling of warmth and tingling is quite noticeable but that is normal. A burst mode facilitates waxing.
The result is visible rather quickly but only after a few uses. The hair does not "fall" under the light pulse, it pushes less and less, shade ...
Device practical and economical but still some investment to purchase.