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USB & Bluetooth Conference Speakerphone-KT-M4B

◈ Internet conference call

Support general audio and video conferencing software, such as Zoom, WeChat etc.

◈ Bluetooth call

After mobile phones and tablets are connected to the device via bluetooth, they can have high-quality speakers and microphones

◈ The third generation

KATO voice processing Technology

Smart pickup with 360° high coverage

384ms echo cancellation

Full-duplex call technology

Intelligent dynamic noise reduction

HD audio

In Bluetooth playback mode: 48K playback sampling rate

◈ Portable microphone and speaker

No need to drive, plug and play

Clear sound quality, no noise and no harshness

Small size, easy to carry

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Desktop host computer with audio processing function and USB function control,

indicator lights and buttons

Built-in large capacity lithium battery

Bluetooth 5.0


Diameter 120mm

Height 39.5mm

Net weight



Carbonite Grey


USB 2.0

(compatible with USB 1.1)


Omnidirectional microphone

Audio bandwidth 100~16KHz

Sensitivity: -38dB

94dB SPL@1KHz

Signal to noise ratio: 65dB

94dB SPL@1KHz, A-weight


2 inch antimagnetic speaker


Power supply

USB bus power supply (5V500mA)

Built-in lithium battery power supply (2000mA)

Computer system requirements (USB)

Windows 8 / Windows 7 / Windows 10/mac OS, etc

Mobile phone operating system (Bluetooth)

Android, IOS


Mute microphone`

Volume up/down adjustment

Bluetooth wireless communication


Bluetooth key (icon status)

Microphone mute button

Volume up button

Volume down button

Switch button (when a call comes in, short press to answer

or hang up; long press to switch)

Product Performance Standards

YD/T 993-1998

GB/T 9254-2008

GB 4843.1-2011

LED status indicator

Normal work:

the green light always on

Speaker mute:

flashing green

Mute microphone:

red light always on

Volume adjustment:

indicator light flashes

Low power:

orange indicator light flashes

Indicator red light always on: charging, the red light goes out after full

Environmental requirements

Temperature: 5°~44°

Humidity: 20~85% (no condensation)

Noise level: <48db Storage temperature: -10°~55° [/av_textblock] [/av_two_third][av_one_third min_height='' vertical_alignment='' space='' custom_margin='' margin='0px' padding='0px' border='' border_color='' radius='0px' background_color='' src='' background_position='top left' background_repeat='no-repeat' animation='' av_uid='av-sri8zq'] [av_textblock size='' font_color='' color='' av_uid='av-rptiee']

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