Easy to use. One branch, we put "on", it adjusts the intensity and as soon as the LEDs do not blink, it flashes! This device that flashes when the skin touches well (hence the lack of glasses), but I still recommend at least close your eyes at every flash, especially when doing the armpits and mustache! Attention you can not use it, in fact, that if you have fair skin and dark hair enough. It is also best not to pass on moles, light (converted into heat) burns darker areas but does not determine whether this is a hair or not! In use, you feel a slight warmth and some tingling. By cons, as efficacy is felt that after a month, I found that for large areas such as legs (very long to do), it is easier (and especially fast) to depilatory wax or electric epilator. However, for areas that I'm used to shaving (underarms, bikini), that's fine because it helps in the long run, to really space the shaves. The leaflet is very well done. 2 caveats: no storage cover of, and not easy to really know where we flashed; he would still find a way to temporarily mark the skin so that we can do something more effective.