Name: luminous hip hop hat Size: Adjustable size luminous hip hop cap, cap around 56-61, allowing about 1 cm error Material: environmentally friendly plastic + acrylic Function: 1.5V (constant light - blinking - off),3V normal (constant / slow flash / fast flash / off),3V voice control (constant / flash / voice / off) Power supply mode: 1.5V is powered by a 7-cell battery, which can last for 5-10 hours. The 3V regular model is powered by two 5th batteries and can last for 15-24 hours. The 3V voice control is powered by two 7-cell batteries and can last for about 10-15 hours. Suitable for occasions: costume party, party party, stage performance, birthday party, Halloween, carnival and other holiday celebrations, Cosplay performances, bar performances, night shows, personalized decoration, etc.