4 mechanical buttons with a pleasant touch for basic functions. Earpiece with magnet to facilitate hanging it. Full-Duplex Audio. Privacy in conversation. Red status led. Capacitive and panoramic touch screen (4.3'' size and 16: 9 format). Resolution 480 x 272 pixels. Make calls to homes, street signs or guard units. The concierge can transfer the call to a home or to another concierge. Receiving calls from homes, street signs or other concierge centers. Communication between two houses through the concierge.