Reference mark with respect to the electrolysis. Easy product to use and handy. Light is a real plus. It must still pass several times for a perfect result. Little painful, except for the armpits, then I understand that it 'feels tight' a little more, but still bearable. (Contrary to what is stated in the manual is more painful in speed mode 1) If like me you are not looking to increase the accessories that are useless, no need to pay more for the top model, it is the job !!
