This bowtie is a unique festival accessory that fits most. Its adjustable length. The bowtie takes 1 AAA Battery that is comfortably hidden in the battery pack. You choose between the standard 3 mode Battery Pack(Fast Strobe, Slow Strobe, Solid Color), or you can choose the Sound Responsive Blink to the beat battery pack upgrade!($10). These bowties will add flavor to any outfit!