How do I set up the Jabra BIZ 2400 II DUO UNC QD?

Simply attach the QD cable to your UC adapter, connect to your device, position the ear cushions, and you’re ready to call—no drivers required.

Are the ear cushions and headband replaceable?

Yes, both ear cushions and the headband are modular and user-replaceable to extend product life and hygiene.

What warranty does the Jabra BIZ 2400 II DUO UNC QD include?

This headset is backed by a two-year manufacturer’s warranty covering defects in materials and workmanship.

How long is the microphone boom arm?

The steel-reinforced boom arm measures approximately 7 cm, allowing precise mic placement for optimal speech pickup.

What is the cable length on the QD connection?

The standard QD cable is 1.5 meters long, providing ample movement while remaining tangle-resistant.

Is the Jabra BIZ 2400 II DUO UNC QD comfortable for full-day use?

Yes, its lightweight design (55 g), padded headband and leatherette ear cushions ensure all-day comfort.

How do I convert a mono Jabra 2400 II to the DUO version?

Purchase the official Jabra mono-to-duo conversion kit, then swap the headband and ear-arm assembly per the included instructions.

Can I use this headset in a busy call center?

Absolutely—its superior noise cancellation and robust build make it ideal for high-volume call-center environments.

Which regulatory certifications does it hold?

It meets CE, FCC, UL and RoHS standards and is optimized for certified performance on all major UC platforms.

How do I clean and maintain the headset?

Wipe the ear cushions and headband with a soft cloth dampened in mild soap solution; avoid immersing components in liquid.

What is the headset’s weight?

The Jabra BIZ 2400 II DUO UNC QD weighs only 55 grams, minimizing fatigue during extended use.

What level of voice clarity can I expect?

The noise-canceling microphone delivers up to 80% noise suppression, ensuring 99% speech intelligibility on every call.

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2409-720-209

Name: JABRA BIZ 2400 II DUO UNC QD
Brand: Jabra
SKU: 2409-720-209
Rating: 4.3 (6 reviews)

Description:: JABRA BIZ 2400 II DUO UNC QD
Rating:: 4.3(6)
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Brand:: Jabra
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2409-720-209 Overview

2409-720-209-JABRA BIZ 2400 II DUO UNC QD is a professional wired headset engineered for enterprise voice communications. It is a dual-ear (duo) headset equipped with an advanced condenser microphone featuring Ultra Noise Cancellation (UNC), and is designed to connect via Quick Disconnect (QD) for compatibility with a wide range of desk phones and unified communications platforms. The headset supports a wideband frequency response of 80 Hz – 16 kHz, optimizing voice clarity across UC solutions and traditional PBX environments, and leverages digital signal processing (DSP) technology for natural audio and superior noise suppression.

This headset is widely compatible with AV systems, softphones, and leading UC solutions through its modular QD interface, supporting plug-and-play use in boardrooms, meeting spaces, call centers, and unified communications deployments. The Jabra Biz 2400 II Duo UNC QD offers stereo channel configuration and incorporates robust Kevlar-reinforced cables, 360-degree boom arm rotation, and intuitive physical in-line controls (on supported variants), making it ideal for busy professional environments where comfort, reliability, and high-quality audio input/output are paramount.

2409-720-209 price is is available on request. Get immediate quote.

Request bulk order quote for 2409-720-209 for additional pricing. Browse the full Headsets series or explore all Jabra products.

2409-720-209 Specifications

Product Type: Audio Equipment
Audio Device Type: Headset
Microphone Type: Condenser
Speaker Type: N/A
Form Factor: Desktop
Use Case: Conference Room / Unified Communications / Call Center / Meeting Space
Channel Configuration: Stereo
Connectivity: Quick Disconnect (QD)
Input Types: N/A
Output Types: N/A
Power Output (if applicable): N/A
Power Source: N/A
Frequency Response: 80 Hz – 16 kHz
Signal Processing: DSP / Noise Suppression
Audio Codecs Supported: N/A
Mounting Option: N/A
Control Interface: Physical Buttons
Wireless Support: No
Product Name: Jabra BIZ 2400 II Duo UNC QD (2409-720-209)
Height: 7.6
Width: 5.8
Depth: 2.1
Weight: 0.12

Quality Certifications

To get the detailed certification, please go to the Compliance Center.

Product Comparison Table

	2409-720-209	14401-21	28599-999-989	2489-820-209	9556-583-111
Product Type	Audio Equipment	Audio Equipment	Audio Equipment	Audio Equipment	Audio Equipment
Audio Device Type	Headset	Headset	Headset	Headset	Headset
Microphone Type	Condenser	Boom (Noise-Cancelling) / Electret Condenser	Condenser	Condenser	Condenser
Speaker Type	N/A	N/A	Active	N/A	Active
Form Factor	Desktop	Portable	Portable	Desktop	Portable
Use Case	Conference Room / Unified Communications / Call Center / Meeting Space	Unified Communications / Conference Room / Open Office / Remote Work	Unified Communications / Conference Room / Executive Workspace / Remote Work	Unified Communications / Conference Room / Contact Center	Conference Room / Unified Communications / Meeting Spaces / Offices / Call Centers
Channel Configuration	Stereo	Stereo	Stereo	Stereo	Mono
Connectivity	Quick Disconnect (QD)	3.5mm	USB / Bluetooth	Quick Disconnect (QD)	USB / Bluetooth / DECT
Input Types	N/A	3.5mm	USB / Bluetooth	N/A	USB / Bluetooth / DECT
Output Types	N/A	3.5mm	3.5mm / Bluetooth / USB	Quick Disconnect (QD)	USB / Bluetooth / DECT
Power Output (if applicable)	N/A	N/A	N/A	N/A	N/A
Power Source	N/A	N/A	Battery / USB-Powered	N/A	Battery
Frequency Response	80 Hz – 16 kHz	Speaker: 20 Hz – 20 kHz, Microphone: 150 Hz – 7 kHz	20 Hz – 20 kHz	80 Hz – 16 kHz	Speaker: 40 Hz – 16 kHz; Microphone: 100 Hz – 7 kHz
Signal Processing	DSP / Noise Suppression	Noise Suppression	DSP / Noise Suppression / AEC	DSP / Noise Suppression	DSP / AEC / Noise Suppression
Audio Codecs Supported	N/A	N/A	SBC / AAC	N/A	N/A
Mounting Option	N/A	N/A	Desktop / Stand	N/A	Desktop
Control Interface	Physical Buttons	N/A	Physical Buttons / App	Physical Buttons	Physical Buttons / Touchscreen (on base)
Wireless Support	No	No	Bluetooth	No	DECT / Bluetooth
Product Name	Jabra BIZ 2400 II Duo UNC QD (2409-720-209)	Jabra Evolve 30 II HS 3.5mm Jack HS Without Control	Jabra Evolve2 85 Link380A MS Stereo with Stand Black (28599-999-989)	Jabra BIZ 2400 II Duo NC IP QD (2489-820-209)	Jabra Engage 75 Mono - Headset (9556-583-111)
Height	7.6	7.09	8.5	6.5	6.5
Width	5.8	6.26	7.8	6.6	6.7
Depth	2.1	2.36	2.4	2.0	2.6
Weight	0.12	0.25	0.67	0.13	0.153

Reviews & Ratings

Noel Patterson

Robust QD connection and excellent noise control.

Otis Grant

Comfortable dual-ear fit for call centers.

Pierce Dalton

Clear wideband audio performance.

Rocco Steele

Durable build suited for heavy usage.

Shawn Ellis

Reliable professional headset solution.

Theo Martin

Consistent microphone clarity every shift.

Questions & Answers

What is the Jabra BIZ 2400 II DUO UNC QD?

The Jabra BIZ 2400 II DUO UNC QD is a professional, dual-ear noise-canceling headset with a Quick Disconnect (QD) cable and Unified Communications (UC) certification.

What does UNC QD stand for in Jabra BIZ 2400 II DUO UNC QD?

UNC refers to Unified Communications certification for major platforms, and QD denotes the Quick Disconnect connector for fast, tool-free cable changes.

How effective is the noise cancellation on this headset?

Its advanced noise-canceling microphone reduces background noise by up to 99%, delivering clear, professional calls in noisy environments.

Which systems are compatible with the Jabra BIZ 2400 II DUO UNC QD?

It works seamlessly with all leading UC platforms when paired with the correct QD-to-USB or QD-to-telephone adapter.

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2409-720-209 Overview

2409-720-209 price is is available on request. Get immediate quote.

Request bulk order quote for 2409-720-209 for additional pricing. Browse the full Headsets series or explore all Jabra products.

2409-720-209 Specifications

Product Type

Audio Equipment

Audio Device Type

Headset

Microphone Type

Condenser

Speaker Type

N/A

Form Factor

Desktop

Use Case

Conference Room / Unified Communications / Call Center / Meeting Space

Channel Configuration

Stereo

Connectivity

Quick Disconnect (QD)

Input Types

N/A

Output Types

N/A

Power Output (if applicable)

N/A

Power Source

N/A

Frequency Response

80 Hz – 16 kHz

Signal Processing

DSP / Noise Suppression

Audio Codecs Supported

N/A

Mounting Option

N/A

Control Interface

Physical Buttons

Wireless Support

Product Name

Jabra BIZ 2400 II Duo UNC QD (2409-720-209)

Height

7.6

Width

5.8

Depth

2.1

Weight

0.12