High Sec Labs FA10BM-4 USB to Analog Audio Diode / Microphone Support / Low-Pass Filter

Description

The FA10BM-4 Audio Diode is a compact security appliance that enforces unidirectional audio from a host USB source to an analog audio device. It is designed to prevent audio-data leakage by allowing only output audio flow and blocking any inbound audio signals. This protects against covert microphone emulation attacks and data exfiltration over audio channels.

The device integrates an audio diode topology and a low-pass filter that limits passed frequencies to the human-audible range. Microphone support is enabled while the hardware prevents headsets or speakers from being repurposed as input devices. The unit includes push-button controls to disable audio access when a user is away.

Physically the FA10BM-4 measures 85 x 65 x 34 mm and weighs 185 grams, providing a small desktop footprint. It operates across a standard commercial temperature range of 0°C to 40°C and supports storage from -20°C to 60°C. The device is rated for operating humidity 20% to 80% non-condensing and an altitude range up to 10,000 ft.

Connectivity is straightforward: a USB host interface connects to the PC while an analog output connects to speakers or headphones. The unit supports microphone-capable headsets through its analog output path while still enforcing directionality. No drivers are required for basic operation and the device presents as a passive inline hardware filter between host and audio peripheral.

Typical use cases include secure conference rooms, classified workspaces, and any environment where preventing audio-based data leakage is required. The FA10BM-4 is suitable for desktops and meeting tables where a small inline device can be placed between a computer and audio device. It is intended for organizations that require physical controls to enforce audio isolation policies.

Installation is plug-and-play and requires no configuration changes on the host system. The housing is built for desktop use and the push-button control provides a simple operator interface for enabling or disabling the audio path. The FA10BM-4 delivers a hardware-enforced layer of protection that complements software controls and policy management.