United States$5,000,000+
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Gunnar Whitlock
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Robust QD mono headset with excellent noise control.
2406-720-209
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JABRA BIZ 2400 II MONO 3-1 UNC QD
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2406-720-209
- Description:
- JABRA BIZ 2400 II MONO 3-1 UNC QD
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- Brand:
- Jabra
- Condition:
3 Year Extended Warranty
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2406-720-209 Overview
2406-720-209-JABRA BIZ 2400 II MONO 3-1 UNC QD is a professional-grade mono headset designed for unified communications and contact center environments. As a headset, it features a high-quality condenser microphone with noise-cancelling capabilities and wideband audio for crystal-clear voice transmission. The audio configuration is mono, supporting single-ear listening while enabling situational awareness in professional settings.
This headset connects via Quick Disconnect (QD) for compatibility with various desk phones and supported audio devices within enterprise AV and UC systems. With a frequency response optimized for speech (100 Hz – 10 kHz), it provides reliable performance for conferencing, customer service, and office deployments. The Jabra BIZ 2400 II MONO 3-1 UNC QD is engineered for durability, all-day comfort, and flexibility in busy boardrooms, contact centers, and professional meeting spaces.
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2406-720-209 Specifications
- Product Type
- Audio Equipment
- Audio Device Type
- Headset
- Microphone Type
- Condenser
- Speaker Type
- N/A
- Form Factor
- Desktop
- Use Case
- Unified Communications / Conference Room / Call Center
- Channel Configuration
- Mono
- Connectivity
- Quick Disconnect (QD)
- Input Types
- N/A
- Output Types
- Quick Disconnect (QD)
- Power Output (if applicable)
- N/A
- Power Source
- N/A
- Frequency Response
- 100 Hz – 10 kHz
- Signal Processing
- Noise Suppression
- Audio Codecs Supported
- N/A
- Mounting Option
- N/A
- Control Interface
- Physical Buttons
- Wireless Support
- No
- Product Name
- Jabra BIZ 2400 II Mono 3-1 UNC QD (2406-720-209)
- Height
- 6.89
- Width
- 6.89
- Depth
- 2.17
- Weight
- 0.11
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 2406-720-209 |  5578-230-109 |  6599-823-399 |  5399-829-309 |  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 | Condenser | Condenser | Condenser | Condenser |
| Speaker Type | N/A | N/A | N/A | N/A | Active |
| Form Factor | Desktop | Portable | Portable | Portable | Portable |
| Use Case | Unified Communications / Conference Room / Call Center | Unified Communications / Conference Room / Office | Unified Communications / Conference Room / Office / Call Center | Unified Communications | Conference Room / Unified Communications / Meeting Spaces / Offices / Call Centers |
| Channel Configuration | Mono | Mono | Stereo | Stereo | Mono |
| Connectivity | Quick Disconnect (QD) | Bluetooth / USB | USB / Bluetooth | USB / 3.5mm | USB / Bluetooth / DECT |
| Input Types | N/A | USB / Bluetooth | USB / Bluetooth | USB / 3.5mm | USB / Bluetooth / DECT |
| Output Types | Quick Disconnect (QD) | Bluetooth / USB | USB / Bluetooth | USB / 3.5mm | USB / Bluetooth / DECT |
| Power Output (if applicable) | N/A | N/A | N/A | N/A | N/A |
| Power Source | N/A | Battery / USB-Powered | USB-Powered / Battery | USB-Powered | Battery |
| Frequency Response | 100 Hz – 10 kHz | 100 Hz – 15 kHz | 20 Hz – 20 kHz | 20 Hz – 20 kHz (speakers), 100 Hz – 10 kHz (microphone) | Speaker: 40 Hz – 16 kHz; Microphone: 100 Hz – 7 kHz |
| Signal Processing | Noise Suppression | DSP / AEC / Noise Suppression | DSP / Noise Suppression | DSP / Noise Suppression | DSP / AEC / Noise Suppression |
| Audio Codecs Supported | N/A | N/A | N/A | N/A | N/A |
| Mounting Option | N/A | N/A | N/A | N/A | Desktop |
| Control Interface | Physical Buttons | Physical Buttons | Physical Buttons | Physical Buttons | Physical Buttons / Touchscreen (on base) |
| Wireless Support | No | Bluetooth | Bluetooth | No | DECT / Bluetooth |
| Product Name | Jabra BIZ 2400 II Mono 3-1 UNC QD (2406-720-209) | Jabra Stealth UC Bluetooth Mono Headset (5578-230-109) | Evolve 65 MS Stereo | Jabra EVOLVE 30 II UC DUO | Jabra Engage 75 Mono - Headset (9556-583-111) |
| Height | 6.89 | 2.57 in | 6.7 | 6.89 | 6.5 |
| Width | 6.89 | 0.61 in | 6.1 | 5.75 | 6.7 |
| Depth | 2.17 | 0.95 in | 2.3 | 2.11 | 2.6 |
| Weight | 0.11 | 0.28 lbs | 0.31 | 0.28 | 0.153 |
Reviews & Ratings
L
Lennon Mercer
5
Durable design handling intensive call center usage.
S
Soren Delgado
5
Clear wideband audio supporting professional communication.
J
Jovan Erickson
5
Comfortable fit throughout long support shifts.
B
Briggs Holloway
5
Reliable QD connectivity and predictable performance.
A
Alonzo Kirk
5
Strong microphone pickup in busy environments.
M
Maddox Reeves
5
Dependable enterprise headset for contact centers.
Questions & Answers
What devices are compatible with the Jabra Biz 2400 II Mono 3-1 UNC QD headset?
The Jabra Biz 2400 II Mono 3-1 UNC QD works with most desk phones, PCs, and mobile devices when paired with the included 3-in-1 UNC cable and Quick Disconnect (QD) connector.
How does the 3-in-1 UNC cable function?
The 3-in-1 UNC cable integrates RJ9 (4-pin), 3.5 mm and 2.5 mm connectors, enabling seamless switching between desk phones, smartphones and tablets without additional adapters.
What is the Quick Disconnect (QD) feature?
Quick Disconnect lets you detach the headset from its cable in seconds, facilitating easy call transfers and stowing without unplugging from your device.
Does the Jabra Biz 2400 II Mono offer noise cancellation?
Yes, its ultra-noise-cancelling microphone filters background noise, ensuring crystal-clear voice quality even in busy office environments.
Can I use this headset with PC softphones?
Yes, by connecting the 3-in-1 UNC cable to your PC’s audio jack or USB adapter, you can use it with Skype for Business, Zoom, Microsoft Teams and other VoIP applications.
How long is the headset cable?
The total cable length from headset to QD jack is 1.5 m (4.9 ft), providing ample reach for desktop and commute use when combined with your own device cord or adapter.
What warranty does Jabra provide for this headset?
Jabra offers a two-year manufacturer’s warranty covering defects in materials and workmanship for the Jabra Biz 2400 II Mono series.
How do I adjust the headband for a secure fit?
Slide the headband arms up or down to customize tension; the flexible steel core automatically conforms to your head shape for all-day comfort.
Is this headset comfortable for extended use?
Yes, the lightweight design (approx. 25 g) and soft leatherette ear cushion ensure fatigue-free wear over long shifts.
Can I replace the ear cushion and foam mic cover?
Replacement ear cushions and wind-resistant foam mic covers are available as accessories, extending product lifespan and hygiene.
How do I clean the Jabra Biz 2400 II Mono headset?
Wipe ear cushions and headband with a soft, lint-free cloth dampened in mild soap solution; avoid harsh chemicals to protect materials.
What microphone pattern does this headset use?
It features a uni-directional noise-cancelling microphone that picks up voice from one direction, reducing surrounding distractions.
Can I use the headset with a mobile phone?
Yes, connect the 2.5 mm or 3.5 mm plug of the 3-in-1 UNC cable directly to a smartphone’s audio jack for call handling on the go.
How do I troubleshoot audio issues?
Check all connections—headset to QD, QD to device—ensure volume settings are up and test with another compatible device or cable.
Does the headset support inline call controls?
No, the Jabra Biz 2400 II Mono 3-1 UNC QD is a basic QD model without built-in call controls; use your device’s controls instead.
Where can I buy replacement cables or accessories?
Jabra-authorized resellers and the official Jabra online store stock replacement 3-in-1 UNC cables, ear cushions, mic covers and QD adapters.