The TOE is comprised of two hardware devices: The Sentry Secured TX (STX) - a video/audio encoder device, and the Sentry Secured RX (SRX) – a video/audio decoder device. The STX and SRX are configured in sequence between the source device and a secure display output. The SENTRY SRX & STX is a display adapter with an HDMI-in port, HDMI-out loopout port, one-way optical fiber port, and a 12V power connector. The STX device is the main device transforming HDMI digital signals into optical signals transferred via optical fiber. It includes an HDMI loopout port (to provide a local copy of the video source displayed), an EDID emulator that forces signal resolution to avoid communication errors with the final display, and a HDMI to Optical Fiber transceiver. The SENTRY SRX is a display adapter with an optical fiber-in port, an HDMIout port, and a 12v power connector. The SRX transforms optical signal back into HDMI digital signals.

The TOE major security feature is protection of data through enforcement of a one-way data stream at the hardware level, by physically removing all unessential data streams, and emulating a clean signal in order to ensure compatibility.

The TOE enforces a one-way video and audio data stream from the source device to a secure output display device, ensuring that only the video and audio channels are passed through, and no data can be passed back to the source device through the TOE, therefore protecting all other connected devices from unwanted communications.