- American Telephone & Telegraph User's Manual Small Business System Speakerphone with Intercom and Caller ID/Call Waiting 974

Technical specifications
REN 0.3B
Power adapter Input: AC 120V, 60Hz
Output: DC 12V, 500mA
Battery One 9V alkaline battery required
Intercom signal frequency Data 455 KHz
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Technical specifications
Technical specifications
Technical specifications
974CIB_06 4/7/06 3:33 PM Page 87