Full 360º Ultrasonic Sound Wave Microphone Blocker
Covers Up to 6 Square Metres for Private Spaces
AC Mains & Battery Operated with 8–9 Hours Runtime
Works on Smartphones, Tablets, Recorders & Cameras
Protect Yourself From Unwanted Audio Recording
Free UK Shipping
30 days Easy Returns
F11 Ultrasonic Sound Wave Generator Voice Recorder Jammer
The F11 is a specialised security device engineered to protect the confidentiality of sensitive conversations. It functions by actively interfering with unauthorised listening and recording of voice data, neutralising threats from mobile phones, voice recorders, audio bugs and advanced audio-filtering or recognition software.
Core Technology and Security Features
The F11 utilises low and high-frequency ultrasonic sound wave interference to create a secure acoustic environment. This can not be heard by human ear unless within 30-50cm.
Intelligent Disruption: The device emits ultrasonic signals that overwhelm the diaphragms of microphones, rendering captured audio unintelligible.
Targeted Neutralisation: It is designed to disrupt not only standard hardware but also sophisticated software designed for voice recognition and interference filtering.
Human-Centric Design: The emitted frequencies are virtually imperceptible to the human ear and are fully compliant with health safety standards, allowing for discreet operation without distracting participants.
Operational Customisation
The device offers granular control via a dedicated control interface on the back panel:
Emitter Management: The back panel features multiple switches, each governing a specific bank of ultrasonic emitters.
Directional Control: By toggling these switches, users can activate specific emitter groups to focus interference toward the suspected location of recording devices. This adaptability ensures the F11 remains effective in diverse architectural layouts and seating arrangements.
Deployment and Performance Specifications
To ensure maximum suppression efficiency, the F11 should be deployed according to the following technical parameters:
| Parameter | Optimal Requirement |
| Placement Height | Positioned at table level for direct acoustic coverage. |
| Orientation | Front-facing toward the potential recording threat. |
| Effective Range (Voice Recorders) | Up to 3 meters of effective disruption. |
| Effective Range (Microphones) | Up to 5 meters for wired or wireless microphones. |
| Line of Sight | Performance is maximised when a clear path exists between the jammer and the target. |
Orders are processed and shipped promptly. Returns accepted within 30 days if unused and in original condition. Faulty items can be returned within 60 days for exchange or refund. All products include a 12-month manufacturer warranty.
Check the recent reviews
"Works well in different environments. I had privacy concerns, and this solved them."
"Does the job without any complications."
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