The Potter Amseco VSA2 is a kit consisting of one (1) VSA-1 Controller/Microphone, one (1) VSM microphone, and one (1) RTA remote test annunciator. Coverage can be expanded by adding eight (8) additional VSM microphones for a total of ten (10) microphones, including the VSA-1control unit/microphone. The VSA-1 series is a self-contained sound detection system listed byUnderwriters Laboratories, Inc. for the primary protection of reverberantand non-reverberant vaults, such as bank and mercantile vaults.The VSA-1 system contains a microprocessor driven DC differential balancecontrol which is adjusted so that the impedance of the microphone circuitsare balanced with the internal impedance of the differential circuit. The VSA will alarm through its SPDT alarm relay contacts if the microphone circuit impedance increases or decreases. The main controller and the microphone are combined into a single enclosure. Also known as -Potter Electric Signal Mfg Us KIT W/ VSM MIC VSA MIC ANNUNC - PL-VSA2K
