Get devilishly good looks with LED Blue Devil Horns! They’re perfect for that spooky Satan costume you’ve been dying to wear! To activate these blue glowing light up novelties, simply turn the switch above the battery pack to the ON position. These light up horns are one size fits most and make for a wicked Halloween. 4 AG13 batteries are included and replaceable. Note: This item has a still light function when on, it does not flash or blink.