Provides door intercom (or room monitoring) for four speakers, plus remote unlocking for four doors.
	
Unlocking requires separate power supply and lock mechanism ("door strike").
	
Intercom requires KX-T30865 or similar door speaker.
	
It fits into a dedicated slot inside the 824.
	
Easy installation.
	
It can also activate a standard door bell or chime (power supply not included).
	
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