Viking 30 Watt Telecom Paging Amp with Loud Ringer. Drive up to (30) 8 ohm speakers. 70V output can drive up to (50) 70V speakers. Master volume control. Separate volume controls for Auxiliary input, paging, ringing tones, and background music. Choose from up to 4 ringing sounds: - Electronic warble (traditional loud ringer), Double gong (two identical "gong" tones), Quadruple chime (four descending chime tones), Door chime (ding-dong). Provides loud ringing or night bell. Night transfer switch. Page from an unused trunk port or paging port. Can provide background music from an external source. Use as a low cost stand alone power amplifier. 600 Ohm output to drive additional amplifiers. Use multiple units for more paging power.