Flashing Hawaiian Lei. The lei custom was originally introduced to the Hawaiian Islands by early Polynesian voyagers who made the incredible journey from Tahiti. Hawaiians wore them to beautify themselves or offered them to each other as a symbol of love and friendship. Leis were constructed of flowers, leaves, shells, seeds, nuts, feathers and even the bones and teeth from various animals. Our special leis is made up of poly flowers and colorful flashing LED lights. Wear these awesome Hawaiian flashing rave necklaces to party like Hawaiian. Use at Mardi Gras, Luaus, Clubs, Parties get togethers or anywhere else you have fun! This light up lei comes with two sets of batteries.