This APP is used with GTMedia HDTV Mate together to allow users watch ATSC1.0/3.0 UHD and HD channels for free. It can be used in both static and moving scenes with great performance. Theoretically, it supports any smart device with a USB interface, such as android TV, tablet, OTT box, smart phone, car computer and etc. When you enter the app, you can see how it works on different scenarios. HDTV Mate is a very small, lightweight and easy-to-carry device, and you can use it in door and out door. By the way, this APP just supports android 9.0 and above so far. It will support the android version under 9.0 in the future.