Light Up LED Shark Fin Headbands are the perfect summertime costume accessory to wear out on warm nights near the beach. What better way to enjoy 4th of July fireworks? Light Up Shark Fins are a hoot - get laughs and smiles from all who cross your path. To activate your LED Shark Fin Headband, remove pull tab and press button on the side. Choose from many fun light functions: flash, slow change and steady lights. NOTE: Position headband ends in front of your ears for most comfortable fit - LED Fin will hug the back of your head.Dimensions (WxH): 5.5" x 9" LEDs: Multicolor. Light Up Shark Fin Headband comes ready to use with 3 replaceable AG13 Batteries.