You naughty devil with horns of blue With flashing horns fun’s never overdo I bet you wear them whatever you do Crazy every minute, like a deja vu Instructions: To activate the glowing blue devil horns simply turn the switch above the battery pack to the ON position. These light up devil horns are one size fits most. Look here for more Light Up Blue Items! Note: This item has a still light function when on, it does not flash or blink. Dimensions: Height: 6.0 in. , 15.24cm. Width: 6.5 in. , 16.51 LED Colors: 2 Blue Batteries: Includes 4 AG13 Batteries. Batteries for this item are replaceable. Packaging: Each Devil Horn headband is packaged in a clear plastic bag.