7 light up colors + 4 flashing modes: LED fiber optic hats light up in 7 colors; 4 Modes flcker - Monochrome, Flash, Gradual, Polychromatic. The LED baseball cap is very beautiful for event/ party. Szie: The luminous hat is unisex. It is for men or women. With adjustable strap and buckle. It fits almost all, easy to wear. No hot, No Radiation, Harmless to the Body and durable. Rechargeable: USB rechargeable battery for power, the light up fiber optic hat supports USB charging and can be used for 2-4 hours on working(light up red, green and blue in color can working about 4 hours. The other colors can working 1.5-2 hours) . Charging time is 2 hours for full charging. The LED hat can be gently hand washed (scrub only, can not knead and twist ) with water up to 50 degree centigrade or natural soap, but the battery box must be taken off or keep away from water before washing. Please take off the battery box and please keep the plug of wire away from water. This fabric must not be washed in washing machine. Dryer or iron is forbidden.( Hang dry only).