The Sound Bar Remote app provides easy operation for select Yamaha Sound Bars using your iPhone, iPod touch or iPad. [Key Features] - Basic control functions such as volume up/down and input selection - Sound mode selection [Supported Models] SR-B40A, SR-B30A, SR-B20A, SR-C20A, SR-C30A,ATS-B400, ATS-B300, ATS-B200, ATS-C200, ATS-C300, 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.