Weiduka&reg; Multicolor Fiber Optic Light Colourful Changing Lamp With Color-Changing Crystals 1.A Beautiful Fiber Optic Light As Gift Multicolor fit for Any occasion 2.Remove the battery cover from the base of the unit. 3.Insert 3AAA batteries(not included)in the the compartment and place the cover 4.See diagram for correct polarity. 5.Switch the power ON to illuminate.