Broan IMA516 4-5/8 x 7-5/8 Inch Eggshell White Intercom System Control Amplifier

This the perfect choice for residential or small office use. It allows you to talk from any station to all other stations or answer the door from any station while response is hands-free. The 'Talk Lock' feature allows you to monitor activities in other rooms. Auxiliary program audio input allows you to connect and play audio from an external low level audio source to all stations. 'Master' station mounts in a utility room, closet or other our-of-the-way location and surface mounts.