Name: Rabbler MNG-300 Voice Recorder Blocker, 3 Metre Speech Masking
Brand: VIMEL
SKU: Rabbler
Price: 729.0 NZD
Availability: InStock

Rabbler MNG-300 Voice Recorder Blocker, 3 Metre Speech Masking

$729.00 NZD

Quantity

Key Specs

Masking Type

Dynamic speech pattern audio

Frequency Range

300 to 3600 Hz

Effective Radius

3 metres

Battery

5 hours, USB pass-through

Controls

Power, volume and level indicator

Size

85 x 53 x 21 mm

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Description

Boardrooms do not usually leak through the walls. They leak through the phone on the table, the watch on a wrist, and whatever is sitting in a bag by the door.

The Rabbler MNG-300 fills the room with dynamic, speech-shaped audio across 300 to 3600Hz, the band human speech occupies. A microphone within three metres hears a crowded room. It is 85 by 53 by 21mm, runs five hours on a charge with USB pass-through for longer sessions, and comes with a carry pouch.

Features

Speech Shaped Masking: The output is built from real speech patterns rather than flat white noise, so it sits in the same 300 to 3600Hz band as the conversation it is covering.
Three Metre Radius: One unit placed in the centre covers a normal meeting table. Anything with a microphone inside that radius picks up the masking along with the room.
Harder To Strip Out: Noise reduction software is built to remove steady, predictable noise. Dynamic speech-like audio does not present the stable profile those tools look for.
Five Hours On Battery: USB pass-through charging keeps it running through a long deposition or negotiation.
Pocket Sized: 85 by 53 by 21mm with a protective pouch, so it travels in a jacket rather than a case.
No Setup: No app, no pairing and no configuration. Power on, set the level, start the meeting.

Applications

Real-World Scenarios

A Meeting Table In A Room You Do Not Control

Commercial terms, partnership discussions, pricing. The three metre radius covers a standard table from the centre.

Because the masking is audible, everyone in the room knows it is running, which suits a meeting where all sides have agreed the conversation stays in the room.

A Professional Consultation

Legal, financial or advisory work where what a client tells you is confidential.

The speech-shaped output sits in the same 300 to 3600Hz band as the conversation, so a microphone a couple of metres away captures both together. People facing each other can still talk normally.

Somewhere An Ultrasonic Unit Will Not Fit

The ultrasonic blockers in this range are the size of a speaker. This is 85 by 53 by 21mm and goes in a jacket pocket with its own pouch.

It works differently as well as being smaller: masking adds sound to the room rather than interfering with the microphone hardware. Whether that suits you depends on whether an audible layer of chatter is acceptable in the room.

How it Works

Charge it over USB and place it near the centre of the table, so the three metre radius reaches everyone.
Power it on and set the level using the indicator. Loud enough to mask, quiet enough that people can still hear each other.
The unit plays dynamic speech-pattern audio across the 300 to 3600Hz band. Microphones in range record your conversation mixed into it, which is what makes the recording hard to use.

Specifications

Power: 5V, 2A maximum. Use the adapter supplied, or a standard 5V USB charger or power bank rated 2A or less. Do not use fast chargers (USB-C PD, Quick Charge, Super Fast Charging) or high-output power banks: they can damage the device.

Model: MNG-300 Rabbler
Masking Type: Dynamic speech-pattern audio
Frequency Range: 300 to 3600 Hz
Effective Radius: 3 metres
Battery Runtime: 5 hours continuous
Input Voltage: 9V
Current Draw: Up to 120mA
Charging: USB (pass-through capable)
Controls: Power, Volume, Level Indicator
Dimensions: 85 × 53 × 21mm

Frequently Asked Questions

Is this the same as an ultrasonic blocker?

No, and the difference matters. An ultrasonic blocker emits sound you cannot hear that upsets the microphone itself. The Rabbler is audible masking: it adds speech-like sound to the room so a recording holds your words buried in chatter. You can hear this one working.

Will people in the room be able to talk normally?

Yes, at a sensible level. It is designed so people facing each other can hold a conversation while a microphone a metre or two further away struggles.

How far does it reach?

Three metres from the unit, which covers a standard meeting table from the centre.

Can recording software filter it out?

Noise reduction tools work best against steady, predictable noise. Because the output is dynamic and shaped like speech, it does not give those tools the stable profile they need. No masking device can promise that no recording will ever be recovered.

How long does it run?

Five hours continuous on the battery, and it charges over USB with pass-through, so it can stay powered during a long session.

Is it legal to use one of these in New Zealand?

You can protect your own conversations in a space you control, and that is what this is made for. Two things to keep in mind. This is an audible masking device: it plays sound into the room rather than emitting radio signals, so it is not a radio jammer, and radio frequency jamming equipment is regulated separately under the Radiocommunications Act 1989. And it affects every microphone in range, including ones you may be relying on, so switch it off before a call you want recorded and never use it to interfere with a recording someone is lawfully entitled to make.