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To activate your LED Shark Fin Headband, remove pull tab & press button on the side. Choose from many fun light functions: flash, slow change & 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 Comes ready to use with 3 replaceable AG13 Batteries. LED Shark Fin Headband by Blinkee All Products, Animals, Flashing Headbands, Halloween LED Light Up Party Favors, LED Fashion and Costumes, Rainbow Multicolor