ASA Audio is an all-in-one remote control for select heavy duty and marine stereos from ASA Electronics. The ASA Audio app lets you control source selection, playback functions, volume, zone control, EQ settings, and balance & fade settings. Currently compatible with JENSEN Heavy Duty JHD36A stereos, Marine Audio MA100, MA110, MA200, MA300, MA400, and MA500 stereos, and Polk Ultramarine UM1A, PA4A, P1, and UM2 source units.