The magnifying glasses comes with a set of different magnifiers, which are stored separately in a small box. The exchange of these magnifiers is problem. The adaptation to different head sizes can be easily fixed by changing small screws. Only with the switchable illumination I am doing something difficult. The burn time I find too low, the batteries are quickly empty! Otherwise the glasses is a good help for me to handle small objects. But I think that reading glasses with a high diopter at the discount is the cheaper and simpler alternative.