1、This is a flexible LED screen controlled by a mobile phone for APP, using high‑quality flexible materials, which can be bent. 2、Can support text, graffiti, animation, music rhythm and brightness adjustment. Rechargeable, LED screen to display power, easy to carry, can be used in wearable products such as hats, backpacks, shoes, etc. 3、Bluetooth link mobile phone wireless input, light and simple self‑media, support for displaying other languages such as 8 common languages, and independently develop supporting APP. 4、The embedded screen is perfectly combined with the hat, which is light and beautiful. The battery concealed cassette is set in the hat to hide the battery perfectly. 5、A cool hat with LED lamp chips, it makes you the focus of the crowd. Ideal for concerts, carnivals, bars, clubs, electric light contests, LED parties, Halloween, fancy dress parties, Christmas, carnivals, etc. 1 x LED Display Cap1 x Manual1 x USB Charging Cable  Item Type: LED Display CapMaterial: Cotton + Plastic Color: As Pictures Shown Cap brim: Approx. 18x7cm/ 7.1x 2.8inLight soft screen size: approx. 150x33mm/ 5.9x 1.3inWeight: Approx. 135g/ 4.8ozHat fit head circumference: reference about 50-60cm/ 19.7- 23.6in (adjustable)Power supply: Built-in polymer lithium battery 450mAh (product shipped with battery)Charging: USB quick chargingLED screen: LED flexible screen, using high quality flexible materials, can be bent.How to use:App download: Please scan the code to download the APP, or you can search "CoolLED1248" in the App Store to download the APP.Coolled1248 is an APP which is specially used to control the display screen. It supports functions such as editing, hand-painted graffiti, DIY animation, music rhythm, etc. It is easy to operate and can be displayed on the screen immediately after modification. The specific operation of APP can refer to the manual.The application will automatically search for the LED display and display the device in the device list. If the automatic search fails, drop the device list box and refresh manually.APP connection operation: 1. Turn on the hat switch; 2. Turn on Bluetooth and open APP; 3. The application will automatically search the LED display and connect the device; 4. After successful connection, APP starts editing operation display.Instructions for LED cap: 1. Long press the button to turn on/off LED display. 2. Double-click the button to switch the direction of the display.