electrical - What do the buttons on a Comelit Okay Simplebus2 Intercom/door entry system do? - Home Improvement Stack Exchange
voltage - How to replace push buttons on an intercom? - Electrical Engineering Stack Exchange
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Moving into an apartment complex with 2 friends. What are these buttons with dots on the intercom? If you press the 3 dots and 2 dots button you hear 4 beeps, while
Push The Intercom Help Button Stock Photo - Download Image Now - 2015, Assistance, Banging Your Head Against a Wall - iStock