Audio Only Sub Station - The JF-2SD is an audio only Sub Stations that can be connected in place of a sub monitor in JF expanded system. The unit features an oversized TALK button to activate the VOX or PTT style communication, door call-in indicator, a call tone volume control and a button for door release. The JF series has a built in picture memory feature that can be set to record automatically when the visitor calls, or the record can be done manually by the user. Up to 50 images can be recorded at a rate of 1 frame per second and 8 frames per image (400 total frames). Up to 10 images (80 frames) can be saved and protected from automatic overwriting. From the JF-2SD you can answer the call from either door station, communicate with the visitor, and release the door. The JF-2SD can also place an all call to the other monitors/subs in the system. The JF-2SD has an adjustment for the receive volume and an adjustment for the Chime Tone volume.