System 106 Door Station Module Aluminum - Compact audio module with integrated call button for communication between indoors and outdoors. A high-quality microphone and weatherproof speaker ensure clear communication. Power supply via a 2-wire bus. Additional connection for central locking (e.g., required from 3 camera modules). All other System 106 modules (except the audio module) are powered through the door station module. Professional labeling is available through the Gira labeling service.