The K9 covert audio product line is built around the S2-LP digital radio platform — AES-128 encrypted voice, FHSS frequency hopping and Codec2 compression across the 868, 433 and 458 MHz bands. Five core variants cover RF transmission, non-RF carrier-current deployment and field monitoring.
The flagship encrypted listening device of the range. A compact body- or room-deployable covert audio transmitter delivering AES-128 encrypted digital voice over a frequency-hopping link — clear capture with no recoverable audio for a counter-surveillance receiver.
A reduced-footprint covert audio transmitter for extended deployment. Voice-activation and store-and-forward burst modes shrink the on-air signature to seconds per day, defeating periodic RF sweeps while preserving the same encrypted, frequency-hopping link.
A non-RF covert listening device that carries audio over mains building wiring rather than the airwaves — invisible to conventional RF bug detectors and air-spectrum surveys. Ideal where the threat model includes routine electronic counter-surveillance sweeps.
The companion receiver for the K9 transmitter range. Decrypts and monitors the AES-128 frequency-hopping link in real time, with paired-key security so only authorised receivers can recover the audio. Built for covert field monitoring of one or more deployed transmitters.
A power-amplified variant of the core transmitter for longer stand-off distances and difficult RF environments. Retains the encrypted, frequency-hopping architecture while adding link margin where the receiver must sit well outside the target area.
Full datasheets — power output, sensitivity, battery endurance, range figures and concealment options — are released to qualified buyers on enquiry, subject to end-user qualification and UK export controls.
Every device in the range can be supplied as a board-level module for integration into a bespoke concealment, or white-labelled for established professional surveillance equipment distributors under territorial agreement.