Expandable system accepts a second master intercom (sold separately) for large areas or multiple rooms Discover Products | Security Solutions for Every Application Intercom System Aazon.co: Aiphone C-123LW ChieCo Single-Door Answering Syste With Door Intercom System Main Features · Push-to-talk door answering with automatic shut-off · Backlit call button at the door station · Chime and voice volume control · CHIME and VOICE... Listening feature allows the master intercom operator to receive audio transmission from the door intercom at any time This single-door answering system allows you to easily communicate with and screen visitors before granting them access Backlit call button for visibility
