Description: Sound-Activated LED Baseball Cap: This fun and interactive cap is activated by sound and flashes with the rhythm of music. It's a hat with lights, an adjustable buckle for a super comfortable fit, and powered by 2 AAA batteries (not included).Built-in LED Lights: The colorful lights on the brim are activated by a small switch hidden in the brim of the flashing LED baseball cap. Once activated, its modern and fun design will flash with the music in the room, making it the suitbale hat to wear at concerts, festivals, club or bachelor parties.Quality Flashing LED Baseball Cap: Made from premium materials, our baseball cap features built-in lights with great stitching, and power switch. It's sturdy enough to last for a long time.Adjustable 1-Size-Fits-All LED Baseball Cap: Our baseball cap design includes built-in LED lights and uses snap closure that allows you to adjust the size of the baseball cap to comfortably fit your head.Product Specifications: The material is cotton; product dimensions are 7cm brim length, 11cm height and 57-62cm circumference; package includes 1 piece hat. Specification: Material: Cotton Please note that batteries are not included in this package. Size Chart: Brim length: 7cm/2.76inch Height:?11cm/4.33inch Hat Circumference:?57cm-62cm/22.44inch-24.41inch Package Includes: 1 LED Baseball Cap Note: Please note that batteries are not included in this package.