lnstallation in 060 mm box combinable with series of mechanisms. 11 works with remoles 5503, 5506 and with the volume compensator 10405. 11 allows hands-free communication between the residen! and the assistance personnel, or analyze the ambient sound of a room. Electret omnidirectional microphone to capture the entire surtace of the room. VERY IMPORTANT: 11 is recommended NOT to place the system speakers (G26U/16 or others) near the microphone; since in FULL-DUPLEX mode you can produce feedbacks or acoustic couplings. Finish: white. Frame not include.