[Key Features] - Basic control functions such as volume up/down and input selection - Sound mode selection [Supported Models] SR-C20A, SR-B20A, ATS-B200, ATS-C200, YAS-108, ATS-1080 [iOS Version Requirement] This application supports iOS version 14.1 or above. -This application uses Bluetooth function on your smartphone / tablet for the purpose of controlling Bluetooth enabled devices.