VTech BM4500-OWL - Two-Way Talk Feature

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5.6 Talk to the Baby Unit
You can broadcast messages from the parent unit to any one of the baby
units.
To talk to the baby unit:
Press and hold TALK on the parent unit. Speak towards the MIC
(microphone) on the parent unit. The TALK light is on when the voice
connection to the baby unit is made. Your voice is broadcast to the baby
unit. Release the key to stop the broadcast.
Note
The TALK feature does not work in Split Baby Unit mode.