The A100A cockpit voice recorder is composed of three essential components: the Recorder Unit, Control Unit Components with area microphone module, and Vibration Mount. A Heavy–Duty Vibration Mount is available for rotorcraft installations. The A100A simultaneously records four separate channels of voice recording of either transmitted or received signals that originate typically at the pilot's station and in the co-pilots station, the passenger public address system or the third crew members station in the cockpit area. The cockpit area microphone is strategically located to pick up and record cockpit voice signals while electronically suppressing engine or turbine noise . The A100A is a endless- loop magnetic tape device that records all voice signal transmitted or received by aircraft crew member for a max period of 30 minutes of contiguous operations. Voice recording after 30 minutes will automatic be erased. The A100A is housed in a orange one half ATR short equipment case and consists of a magnetic tape recorder. The A100A is a unit with attached Underwater Locator Beacon (ULB) and ULB mount. The A100A is explosion proof with a 4 track playback, with complete internal circuit for bulk erase. The A100A tape recordings are protected against aircraft accidents.