COLOR: BLACK==>MASTER TELEPHONE,ODA-1780-1NK (SET)

COLOR:GREEN==>SLAVE TELEPHONE,ODC-2780-1 (SET)

ODA-1780-1NK==>PLUG-IN TELEPHOBE W/SPACER (SET)

ODA-1780-2NK==>PLUG-IN TELEPHONE W/SPACER (SET)

ODA-1780==>BRIDGE TELEPHONE for internal/communication=110V/50 to 60 Hz (PCS)