FLASHING FIBER OPTIC HAT w/ "LAS VEGAS LOGO. High Powered L.E.D.'s Light Up State of the Art Fiber Optic technology built into these Custom Embroidered Caps. High quality 6 panel Baseball caps complete with a self adjustable strap will fit most any head. GREAT LOOKING IN EITHER DAYTIME OR NIGHT . Batteries are included and installed. Price shown is for each cap. Please order in increments of 1 cap per style. Replacement batteries for this item: 2 pcs, type CR2032.