MTN3901-0006 is a Schneider Electric Merten inserts lamp attachment for push-button and switches.The light source of this lamp attachment is LED.The rated operational voltage goes from 100V up to 230V.And it is mercury free.As well as heavy metal free, taking care of the environment and your health all the time.Merten inserts can be combined with all various centerplates and outerframes designs of Merten System M , Merten Artec, Merten Antique.