This is an APP that can control the display of the LED screen. However, we need to purchase the corresponding equipment (an Android embedded device) for controlling the LED screen . The APP controls the LED screen by controlling the device. With this app you can publish text, video or picture programs to the LED screen while also controlling the brightness, color temperature and volume of the LED screen. The address of our official website is https://www.calibreuk.com/en-emea .