The Sony RMS170 Audio Remote Control is originally supplied with Audio System models: Sony HCRRX110A, Sony HDL2000, Sony HSTD10, Sony HSTD107R, Sony LBTD107, Sony LBTD107R, Sony LBTD117, Sony LBTD517, Sony LBTD517CD5, Sony LBTD550 Sony RMS170
The Sony RMS170 Audio Remote Control is compatible with Audio System models: Sony HSTA20, Sony HSTA20K, Sony HSTA22K, Sony LBTA20, Sony LBTA20K, Sony LBTA22K, Sony LBTA27CDK, Sony LBTA27CDM, Sony LBTD209CD, Sony LBTD259CD Sony LTA20