Aiphone IBG-2CD is a sub station chime intercom designed for either desk use or wall mounting. It includes a button for door release and can be used with up to two door stations and two room sub-stations. The IBG-2CD has a melodic two stroke chime with volume control and lamp memory for door station call in. It also works with the MB-D-DA/MB-U video intercom system and can be extended with IBR-1 to announce a call from the door in a place remote from the master and room sub-stations.