Answering the door is just as easy as using the intercom. When the door chime rings, simply press the buttons at any speaker and talk. Just release the button to hear the reply. Up to 3 door speakers can be used. You can even add the basic 8-note chime or a 10-tune musical chime option that plugs right into the system to hear the door chime at every station. The monitor feature allows you to keep in touch with your family while still providing the freedom to move around the house. Especially useful for families with babies, small children or a person confined to bed. When monitoring, audio from the room being monitored is sent to all other speakers in your home. The IM-5000 remote station uses an electronic microphone to ensure the sound is precise and clear. Although the IM-5000 does not come with a built-in tuner, you can still play music, sports and news over our system using equipment you may already own. A built-in auxiliary audio input can be connected to any audio source like your CD player, AM/FM tuner or tape player and played through the remote stations. Auxiliary audio volume is controlled by an up/down pushbutton electronic volume control located on every remote station.