The Nutone NDB300WH has been discontinued. The M&S DS3B Door Speaker is an identical substitute.
The weather resistant NuTone NDB300WH Door Speaker allows 2-way voice communication between the visitor and the resident. The lighted bell button rings a chime at the master and the intercom speakers and usually is mounted next to an entry door.
The NDB300WH is compatible with the NM100 and NM200 models as well as most older models except the IK15 and IK25. For new installations use either the Recessed Rough-in or Surface Mount Box.
For replacements: Use the Retrofit Frame if the current speaker goes inside the wall and protrudes about 1/2". Use the Surface Mount Box if the current speaker sits on top of the wall and protrudes about 1 1/2" to 2". Available in 4 colors: