First, read the manual that explains the operating principle and method of use. The device is easy to use, one chosen from the 2 tips offered depending on the size of the treatment area. You plug the AC adapter, it supports the on / off button, the power amount is adjusted gradually according to the tests felt then go. The gun-shaped stand well in hand, the flash is triggered by a trigger. The flash recharges fairly quickly (2s). Level felt, this is like a camera flash, so occasionally it heats the area where you applied the gun (which sticks to the skin, a detector is there to ensure it is properly bonded and the skin pigmentation is not a problem). Which brings us to the disadvantages: -The Treatment area must already shaved beforehand. -The Effectiveness varies depending on the skin color of the hair. This only works a priori not on black skin color / dark or mixed race. In all cases, at best they promise a reduction in the regrowth of 80% ... Yes because in fact instead of tweezers permanently or occasionally, this unit is "only" slow hair growth. -The Schedule of use advocates a session every 15 days for 24 months. So you have to persevere to see the effects. -Price High but relative when compared with institutes costs over time. The advantages: -Product Well designed, easy to handle. Clear -Notices French (full and simplified) -Lampes Removable for replacement when worn