Opt-C:Link Opt-C:Link (OMRON SENTECH) Opt-C:Link Model STC-CMB120AOPT STC-CMC120AOPT STC-CMB120AOPT-F STC-CMC120AOPT-F STC-CMB120AOPQ STC-CMC120AOPQ STC-CMB120AOPQ-F STC-CMC120AOPQ-F