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Black single-ear wired headset with USB-A connector and inline control unit

Jabra Enterprise Products

Jabra Enterprise Products GSA4993-823-109 Evolve 20 MS Mono Headset

SKU CH-KVWQ-HDVAG MPN GSA4993-823-109

Single-ear USB-A headset with noise-cancelling microphone and inline call controls for Microsoft Teams

  • ColorBlack
  • Power SourceRated Input 5mW @0.4V, max input 10mW @0.56V
  • Driver UnitDiameter 28 x 3.9mm
  • Headphone Frequency Response150Hz~7kHz, @Output S.P.L -10dBB
  • Headphone Input Impedance32 +/- 4.8 ohm, @ 1.0kHz
  • Headphone Sensitivity93.6dB SPL @ 1kHz
  • Single-ear design keeps one ear free for office awareness
  • Noise-cancelling microphone filters background sound for clearer calls
  • Inline call-control unit lets you answer and mute without software
  • USB-A plug-and-play connection works instantly on any PC
  • Lightweight 3.67 oz build with foam cushion stays comfortable through long sessions

Single-ear USB headset for calls

The Jabra Evolve 20 MS Mono GSA4993-823-109 is a wired single-ear headset built for professionals who spend the day on calls. It connects through a USB-A control unit that puts call management at your fingertips. The mono design keeps one ear free for office conversation while the noise-cancelling microphone filters background sound. Plug-and-play operation means no drivers are required on supported systems.

Lightweight corded design with inline controls

Weighing 3.67 oz, the headset uses a 28 x 3.9 mm driver with 32 ohm impedance and 93.6 dB sensitivity for clear voice reproduction. The microphone covers 100 Hz to 10 kHz with sensitivity between -48 dB and -44 dB. Power draw is rated at 5 mW at 0.4 V with a maximum of 10 mW at 0.56 V. Two cables — 95 cm to the control unit and 120 cm to the headset — give ample reach without adding bulk.

Consistent audio during long sessions

The foam ear cushion and single-sided fit are intended for comfort across extended workdays. Frequency response of 150 Hz to 7 kHz at -10 dB SPL is tuned for speech rather than wide-range music playback. The wired USB-A link delivers stable power and signal without battery management or wireless interference. Buyers who need stereo coverage or wireless freedom should consider other models.

Highlights

  • Single-ear design keeps one ear free for office awareness
  • Noise-cancelling microphone filters background sound for clearer calls
  • Inline call-control unit lets you answer and mute without software
  • USB-A plug-and-play connection works instantly on any PC
  • Lightweight 3.67 oz build with foam cushion stays comfortable through long sessions

Specifications

BrandJabra
SeriesEvolve 20 MS Mono
ModelGSA4993-823-109
ColorBlack
Power SourceRated Input 5mW @0.4V, max input 10mW @0.56V
Driver UnitDiameter 28 x 3.9mm
Headphone Frequency Response150Hz~7kHz, @Output S.P.L -10dBB
Headphone Input Impedance32 +/- 4.8 ohm, @ 1.0kHz
Headphone Sensitivity93.6dB SPL @ 1kHz
ConnectorUSB-A
Ear CouplingSingle Ear
Cord LengthControl cable: 95 cm/37.40 in, HS cable: 120 cm/47.24 in
Weight3.67 oz.
Microphone Frequency Response100Hz ~ 10kHz @ 6dB
Microphone SensitivityF=1kHz, Pin=1Pa, 0dB=1V/Pa, Min=-48dB, Max=-44dB
FeaturesEngineered for call control. Professional corded headset. Easy call management.
Call control unit for managing calls easily
Great sound for calls and music Plug-and-play connectivity
USB-A Connection
Package ContentsJabra Evolve 20 Headset, USB Controller, Evolve 20 with foam ear cushions, documentation
Shipping weight0.91 kg
Package size254 × 203 × 152 mm

Questions about this item

How do I connect the USB-A control unit to my computer and where does the headset cable plug in?

Insert the USB-A connector into a free port on the computer, then connect the headset cable to the inline control unit; the control cable is 95 cm and the headset cable is 120 cm.

Which parts of the Evolve 20 MS Mono headset typically wear out and need replacement after extended use?

The foam ear cushion on the single ear cup and the microphone boom are the components most likely to require replacement over time.

At what sound-pressure level does the 28 x 3.9 mm driver reach its rated output limit during long calls?

The driver is rated at 93.6 dB SPL at 1 kHz with a maximum input of 10 mW at 0.56 V, which defines its sustained-output ceiling.

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