It takes two people to attach this unit to the wall.  I happen to have 2 electricians in my home to do some work and had them attach the medicine cabinet above my sink in the master bath.  It is heavy and the electricians attached it to the studs in the wall.  They did not use the screws that came with the unit and they did not use the pilot holes..  They said the unit was heavy and would likely fall down as they have seen other heavy medicine cabinets fall when not screwed to the studs.  I bought this medicine cabinet online because I could not find one with lights in the local stores. Now that is it securely attached to the wall, I am very happy with my purchase.