Best Ultrasonic Microphone Jammer for Meeting Room

Proven jamming method: ultrasonic‑mixing / structured ultrasonic noise — top devices use ultrasonic mixing or complex ultrasonic noise to exploit microphone nonlinearity and corrupt recordings without making speech unintelligible to people in the room.

Effective range: 2–6 m typical (choose by room size) — many tabletop/under‑desk units reliably protect a 2–4 m radius; larger floor/ceiling units claim 6 m+ or room‑scale coverage. Match range to your conference room dimensions.

Coverage pattern & directionality: 360° vs. directional — pick a 360° omni emitter for round tables and general-purpose rooms; select directional/ceiling arrays for focused corridors or long boardrooms to avoid over‑jamming adjacent spaces.

Hardware: number of ultrasonic transducers & output specs matter — more transducers and wider frequency bandwidth generally increase robustness against varied microphones and recorders. Check stated transducer count, operating frequency band, and claimed suppression angle.

Power & runtime options (battery vs mains + remote control) — for portable use choose rechargeable models with several hours runtime; for permanent installations prefer mains + remote or network control and central management. Also confirm duty‑cycle / recommended operating time in manufacturer specs.

Compliance & deployment considerations (must read first) — ultrasonic jammers can be regulated or illegal in some jurisdictions and may affect nearby electronics. Before buying or deploying, verify local laws, implement access control (who can turn it on), and test to ensure the device doesn’t disrupt critical equipment. (Manufacturers typically include recommended installation notes