The 4-wire Intercom module ET 562 has been developed for installation in existing housings or for construction of special Intercoms. Equipped with 4-wire technology, in a rugged housing with mounting tabs for easy installation. Applications for this Intercom module are all kinds of call- / emergency call station, where the station is built in. Examples are elevator cabins, emergency call pillars, ticketing machines or barriers at entrances and exits.