Bogen NR100 Night Ringer Module for Telephone Paging SystemsThe VAR1 is a relay device that monitors audio activity over a wide range of input voltages and operates two sets of C Form relay contacts in response to detected activity. The VAR1 can be used to detect voltages as low as signals directly from a microphone or as high as signals from 70V speaker systems. A low level output of the detected audio, transformer isolated from the input, is also made available for use with other equipment. The VAR1 can also