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White mono headset with single over-ear pad, adjustable headband and boom microphone, 3.5 mm plug

Cisco Systems, Inc.

Cisco Systems CP-HS-W-521-USBC 521 Headset Mono 3.5mm Wired 90 Ohm 50-18kHz 118dB telephone accessory

SKU CH-BGY3-2MQFZ MPN CP-HS-W-521-USBC

Mono wired headset with a 3.5 mm plug, 90 Ohm impedance and 118 dB sensitivity for clear calls in open offices

  • FeaturesTechnical Information Connectivity Technology: Wired Sound M
  • Lightweight design keeps you comfortable during extended wear
  • Mono 50 Hz–18 kHz response delivers clear voice and music audio
  • 90 Ohm impedance with 118 dB output ensures loud, detailed sound
  • Unidirectional condenser mic isolates your voice from background noise
  • Wired 3.5 mm connection works instantly with Cisco IP phones and soft clients

Mono Headset for Open Workspaces

The Cisco 521 is a wired mono headset built for professionals who spend long hours on calls in busy offices. Its 3.5 mm connector plugs directly into compatible desk phones or soft-client devices. The 90 ohm impedance and 50 Hz to 18 kHz response are tuned for clear voice reproduction. Lightweight supra-aural design keeps pressure low during extended wear.

Unidirectional Microphone Cuts Background Noise

The electret condenser microphone uses a uni-directional pattern to focus on the speaker's voice while suppressing surrounding chatter. This noise isolation helps maintain call clarity without requiring software processing. The 118 dB sound pressure level ensures the earpiece delivers ample volume for noisy floors. No extra drivers or configuration apps are needed for basic operation.

Over-the-Head Build for All-Day Comfort

An adjustable over-the-head band distributes weight evenly across the crown rather than clamping the ears. The single ear cup leaves one ear open to the environment for situational awareness. Wired 3.5 mm connection removes battery concerns and latency associated with wireless models. Designed to integrate natively with Cisco IP phones and soft clients for plug-and-play deployment.

Highlights

  • Lightweight design keeps you comfortable during extended wear
  • Mono 50 Hz–18 kHz response delivers clear voice and music audio
  • 90 Ohm impedance with 118 dB output ensures loud, detailed sound
  • Unidirectional condenser mic isolates your voice from background noise
  • Wired 3.5 mm connection works instantly with Cisco IP phones and soft clients

Specifications

BrandCisco Systems, Inc
Part NumberCP-HS-W-521-USBC
FeaturesTechnical Information
Connectivity Technology:
Wired
Sound Mode:
Mono
Impedance:
90 Ohm
Minimum Frequency Response:
50 Hz
Maximum Frequency Response:
18 kHz
Sound Pressure Level (A-Weighted):
118 dB(A)
Earpiece
Earpiece Design:
Over-the-head
Earpiece Type:
Monaural
Microphone
Microphone Technology:
Uni-directional
Electret
Condenser
Microphone Design:
Boom/On-cable
Interfaces/Ports
Host Interface:
Mini-phone (3.5mm)
Physical Characteristics
Form Factor:
Supra-aural
Shipping weight0.45 kg
Package size193 × 168 × 51 mm

Questions about this item

How often should I replace the ear cushion on the 521 headset?

The 521 uses a replaceable leatherette ear cushion; swap it when the surface cracks or the foam loses spring, typically every twelve to eighteen months of daily use.

What limits talk time on the 521 during a full-day shift?

The 521 is a passive 3.5 mm wired mono headset with no battery, so continuous use is only limited by the connected desk phone or soft-client device.

How warm does the 521 get after eight hours of calls?

The 521 draws no power of its own and the 90 ohm driver produces negligible heat; the ear cup stays at skin temperature during all-day wear.

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