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 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: Each Devil Horn headband is pack in a clear plastic bag. This item has a still light function when on, it does not flash or blink. Specifications: Height: 6.0 in. Width: 6.5 in. LED Colors: 2 Blue Batteries: Includes 4 AG13 Batteries