Automatic alert message announcing for emergency situationEasy and convenient to play & recording2 ways recording via self MIC built-in or via externalmessage inputHead phone jack to monitor recording statusZero-power message storage (No backup battery)100,000 times life cycle for recording repeatedbuilt-in fault self detector of microphoneBusiness call will be stopped incase of emergency callHigh-quality, natural voice/audio reproductionRecording time of 60-seconds100-year message retention (typical)