- 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- Accomodates 6 lines each - 4 Units can be connected together for up to 24 lines- Built-in warble tone generator, interrupter, volume control, and punch down block- 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)