Item Type: LED Cap_x000D_Material: Cotton_x000D_Battery: 1 x 602040 Polymer Lithium Battery 450mAh (Built in)_x000D_APP: For SPOTLED APP_x000D_Connection Method: Bluetooth 1APP EDITABLE: The content on the LED screen of this hat can be freely edited through your mobile APP, which is ideal for outdoor concerts, baseball, carnival, Christmas, bars, clubs, holiday parties, Halloween and more. 2REMOVABLE SCREEN: If you do not want your hat to display text, you can turn off the power and use it as a regular hat. And the LED screen can be removed for use elsewhere. 3SIZE ADJUSTABLE: There is a reasonable adjustment buckle at the back of the hat. You can adjust according to the size of your head. No need to worry about the hat being too big. 4COTTON MATERIAL: This LED smart hat is made of cotton fabric and is comfortable to wear. The top is thickened, which is not easily deformed or collapsed, and will not affect the appearance of the hat. 5SIMPLE TO USE: Download the APP on your phone, press and hold the power button to activate the LED screen, and connect to the Bluetooth hotspot on your phone , you can start edit. 1 x LED Cap 1 x USB Cable