Best Under Desk Audio Jammer

Placement & mounting

• Choose models specifically designed for “under‐desk” or “under‐table” mounting (rather than just desktop) so they don’t interfere with table top aesthetics and voices. For example, the iSecus AJ‑315W is described as an “Under‑desk / Wall mount Microphone Jammer”.

• Ensure there’s enough clearance under the desk for the unit, power cable routing, etc.

Coverage / radius & angle

• Check the jamming radius (how far it effectively disrupts microphones) and the angle of coverage. E.g., for AJ‑315W it states coverage ~2 m @70 dB in certain setups.

• For under‐desk placement you may want a horizontal wide angle that covers the table and participants, not just above‐table mics.

Technology & “silent to humans” factor

• Best units use ultrasonic mixing / ultrasonic noise so that human hearing isn’t disturbed, yet recording devices are disrupted. For example: “By emitting ultrasonic noise that is imperceptible to the human ear… the audio jammer can effectively block the recording function.”

• Make sure it doesn’t introduce audible interference or degrade meeting audio for participants.

Power / integration / control

• Under‐desk units may require DC adaptors, mounting hardware, maybe remote or networked control especially if it’s part of a broader secure conference room suite. E.g., AJ‑315W lists power supply 18–24 V DC adaptor.

• Consider whether you want standalone control or integration into a central management system.

Compatibility & environment

• Ensure it works with the types of recording devices you’re concerned about (smartphones, digital pens, hidden mics) and consider room layout, table size, potential reflections (ultrasonic waves reflect off surfaces) which may affect performance.

• Also consider legal/regulatory compliance in your region (some jurisdictions may restrict jamming devices).

Installation & maintenance

• Check mounting kit, size/dimensions to fit under desk without interfering, durability, operating temperature/humidity specs (for conference rooms with AC). E.g., AJ‑315W user manual gives dimension 354×127×26 mm, working temperature –10 °C~55 °C.

• Also ask about firmware/network updates, service/support for the vendor