Product Description:Material: CottonBattery type: 2 x AAA batteries (not included)Number of pieces: 1PCfeature:Voice activation-The baseball cap lights up with music or conversation, attracting attention everywhere. When the music plays, your top fashion baseball cap will flash up and down with the beat.Adjustable sound sensitivity-LED lights pulse with the beat of the music at different intensities. The built-in sensor detects sound waves. The louder the music, the more lights will be activated!Universal-Wear a party hat and become the king or queen of the party! It is very suitable for discos, hip-hop music, concerts, fancy dress parties, parties, cosplay costumes, many night sports such as horse riding, skating, street performances, or even just walking or shopping with friends. Light up your life and make you the focus of the crowd.Safety material-breathable cotton material, light weight, no burden for dancing, singing and night sports. One size fits everyone. The plastic buckle can be adjusted and closed to fit your head perfectly and comfortably.Battery powered-2 AAA batteries are required (not included). The energy source is cold light LED, which is completely safe for your face and eyes.Removable-The display and the cap are separated, and the cotton cap is comfortable to wear. After the screen and battery are removed, it can be washed with water.Style/HAT001Package Included:1 x party hatnotes:1. Transition: 1cm=10mm=0.39inch, 1g=0.001kg=0.0022lb=0.035oz.2. Due to screen differences, the color may be slightly different from what you expected, please allow.