The Sony RMU451 Audio Remote Control is originally supplied with Audio System models: Sony HCD451, Sony HCD461, Sony R4520, Sony R4600W, Sony RMU451, Sony SUS4520,

The Sony RMU451 Audio Remote Control is compatible with Audio System models: Sony FHC33X, Sony HCD505, Sony HCD525, Sony HCD541, Sony HCD551, Sony HCD633, Sony HCDC33, Sony HCDC55, Sony HCDC633, Sony KV2553 Sony KV2553TC Sony MHCC33 Sony R5320 Sony R5520 Sony RM756 Sony RMU302 Sony RMU541 Sony STRD59 Sony STRD590 Sony STRD61 Sony STRD611//M Sony STRD611M Sony STRDE615 Sony STRE581 Sony STRTD511 Sony SUS5420 Sony SUS5420BLK Sony SUS5520