United States$5,000,000+
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N
Noel Patterson
5
Robust QD connection and excellent noise control.
2409-720-209
Original Stock
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JABRA BIZ 2400 II DUO UNC QD
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2409-720-209
- Description:
- JABRA BIZ 2400 II DUO UNC QD
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- Jabra
- Condition:
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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.
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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
O
Otis Grant
5
Comfortable dual-ear fit for call centers.
P
Pierce Dalton
5
Clear wideband audio performance.
R
Rocco Steele
4
Durable build suited for heavy usage.
S
Shawn Ellis
4
Reliable professional headset solution.
T
Theo Martin
5
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.
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.