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Bogen’s ADP1 Analog Door Speaker Phone is a convenient remote,weather-resistant, hands-free two-way terminal device for telephone systems. The unit is telephone line powered and includes adjustable microphone and speaker volume levels as well as a selectable Auto Answer feature to allow for remote audio monitoring of the area where the ADP1 is located. The Analog Door Speaker Phone also includes an adjustable and defeatable call timer and can respond to forward disconnect signals.