Features1DIY CHANGE THE TEXT: LED hat with APP control LED hat display, you can DIY change the text, pattern, music rhythm, call alert. 2FINE CAR LINE WORKMANSHIP: LED cap with fine car line workmanship, precise and sturdy, light and breathable, comfortable and soft. 3STURDY AND DURABLE: LED cap is made of cotton material, strong and durable, not easy to deformation or collapse. 4SCOPE OF APPLICATION: Bluetooth LED light cap is for cycling and night running, making your journey safer. 5USB CHARGING: Bluetooth LED sign cap supports multi language input and uses USB charging, making it very easy to use.SpecificationItem Type: Bluetooth LED Light CapMaterial: CottonBattery Capacity: 450mahBattery Type: Polymer Battery (Shipped With Built In Battery)Input Current: 1ACharging Method: USB ChargingPackage List1 xBluetoothLEDLightCap1 x Data Cable1 x Chinese and English Manual