Product Parameters Product Name: LED Fiber Optic Light-up Hat USB Charging: 5V/1A Hat Color: Black/White Battery Capacity: 300mAh Hat Size: One Size Fits All Hat circumference diameter: 60~65 cm Hat depth: 13.0 cm Brim length: 12.0 cm Charging Time: 2h Product Net Weight: 145g Battery Life: 6-8h Product Gross Weight: 215g Charging Method: Type C Color Box Size: 24*16*7CM • Style: The glowing cap is unisex. Suitable for men or women. With an adjustable strap and buckle. Fits almost everyone and is easy to wear. No heat, no radiation, harmless to the body and durable. • Rechargeable: Powered by a USB rechargeable battery, the glowing fiber optic cap supports USB charging, can work for 3-4 hours, and takes 2 hours to fully charge. • The LED hat can be gently hand-washed with water up to 50 degrees Celsius or natural soap (only scrubbing, no rubbing and twisting), but the battery box must be removed or kept away from water before cleaning. Please remove the battery box and keep the wire plug away from water. This fabric cannot be machine washed. Do not use a dryer or iron. (Only hang to dry). • This running cap with LED lights is perfect for sunshade, dance fitness activities, outdoor sports, festivals and celebrations, bars, clubs, birthday parties, weddings, KTV, carnivals, stage performances, concerts, Christmas, Halloween, etc.