NEC ETU external control relay unit
- (Model# ECR-U10 Stock# 750300)
- Electra Elite IPK
- External Control Relay Unit The external control relay ETU provides common audible tone signaling using relay contacts for external ringing equipment, an audio output for external paging systems, and connection for external background music. Ten relays are provided: four for External Tone Ringer Control, one for Night Chime, three for External Paging, and two for General Purpose.
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