Easy to use device. By cons, nothing to do with the result institute, but it takes a lot more sessions. This is due to the lamp power that can, of course, be equivalent to those institutes BUT with much patience you get the same results. The fact that the power of the lamp is less than in the institutes it hurts less too! -D I recommend! But it is better to start in September at the end of the summer, because it should no exposure of the concerned party in the sun.