Used as an input-matching transformer, it connects telephone systems to most public address amplifiers, for telephone paging. In addition it functions as an output-matching transformer to feed program material over a 600-ohm telephone line for "music-on-hold". It is compatible with any amplifier having a 25V output connection. Hi-Z, 10k-ohm primary impedance Lo-Z, 600-ohm secondary impedance, balanced with center tap Matches high-to-low impedance or low-to-high impedance Adapts lilne level signals to microphone inputs Phono jack on screw terminals for Hi-Z side Screw terminals for Lo-Z side Steel enclosure w/mounting ears allows easy mounting.