MONIKA FASHION WORLD Skeleton Costume for Boys Kids Light up Halloween Size M (5-7) L (6-9) Skeleton costume with mask and gloves and shoe cover. Complete costume. Chest part lights up! Fiber optic lights, Batteries included. It is battery operated and glows / lights up when the button inside the white pouch is turned on. Sometimes battery compartment slips inside the chest part. Please look inside for the wire, at the end of it you will find battery compartment. Thanks.