- Valcom 6 line audible ringer unit - 90 Vac ring or dry contact closure activation - Connects directly to CO line or PBX station lines - Provides ringing over paging speakers - Provides contact closure to activate loud bells during ringing - Accomodates6 lines each - 4 Units can be connected together for up to 24 lines - Built-in warble tone generator, interrupter, volume control, and punchdownblock - Output impedence 8ohm - Power requirements: -24Vdc, 200mA power supply - Dimensions: 8.2"H x 4.55"W x 2.3"D - Weight: 1.9lbs - VALCOM POWER UNITS (-4) VCV9936A