The Sony RMS545 Audio Remote Control is originally supplied with Audio System models: Sony HCDC55, Sony MHC55, Sony MHCC33, Sony MHCC55, Sony RMU541,
The Sony RMS545 Audio Remote Control is compatible with Audio System models: Sony FHC33X, Sony HCD451, Sony HCD541, Sony HCD633, Sony HCDC33, Sony HCDC633, Sony R5520, Sony RMU451, Sony SUS5420, Sony SUS5520