It works great. Nice and handy to use.
Everything works well, and easily connects to the phone. It's super easy to change the text on the hat. My friends and family love the hat. 3 of them bought one for themselves.
The app is simple and even works on an iPhone 6s. You can pick several different preloaded graphics and phrases. The hat power button and Bluetooth synch is located on the same push button. The button on the side of hat allows you to change display without using the app. The battery is also on the same side of the hat as the button and is a small thin LiPo rectangle that fits within the hat liner so it is not sticking out and rubbing against your head! The app allows you to design your graphics or Slogan. Then you choose what style or pattern for the phrase to be displayed in the hat. The app has so many options and updates the hat instantly so you can see your design and animation as you draw or edit on your phone.
I am verre happy with those Led Caps. The quality is good and the leds are working. It's easy to program the led text with your mobile phone.