HighSecLabs Audio Diode Analog to Analog always open no mic, no AT

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  • HighSecLabs Audio Diode Analog to Analog always open no mic, no AT
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FA10AO−4 is an audio diode that mitigates the risks of eavesdropping, when using peripheral audio devices, by forcing unidirectional audio flow and a using low−pass filter.

  • Audio Data Hacking Prevention — The diode blocks listening in to surrounding conversations, by forcing unidirectional flow. This prevents hackers from manipulating a speaker/headphone to function as a microphone, for picking up surrounding conversations. In addition, all sounds passing through the Audio Diode go through a low–pass filter that restricts the audio frequencies to the range compatible with the human ear. This prevents hackers from attacking by broadcasting high–frequency signals to an external hacking device.
  • Easy Installation — Quickly connects to the host PC and audio device.
  • LED Indicators — Shows ON/OFF status and warning before disconnection.
  • Compact — The 85mm X 65mm X 34mm unit occupies minimal space on your desktop.


  • Military
  • Command and Control
  • Finance
  • Government Offices



Environmental Conditions


Cable Inputs Outputs Audio Features
C-A35M/A35M 3.5mm Stereo Audio Cable 1 - 3.5mm (M) 1 - 3.5mm (M) U Lengths − 3−100ft (0.9−30.5m)
CP-A35M/A35M 3.5mm Audio Cable − Plenum Rated 1 - 3.5mm 1 - 3.5mm U Lengths − 10−150ft (0.9−46m)