Poly Blackwire 3300 Series

Plug-and-play USB (USB-C or USB-A) with optional 3.5 mm connectivity for supported models (3315 / 3325)
Flexible noise-canceling microphone boom, 280° rotation, 135 mm length
Dynamic EQ optimizes voice for calls (up to ~6.8 kHz) and supports multimedia (20 Hz – 20 kHz) in stereo models
Inline controls for call answer/end, mute, and volume; optional Microsoft Teams versions include a Teams button

The Poly Blackwire 3300 Series is a line of corded USB headsets built for business / unified communications use. These are plug-and-play, reliable, and designed for all-day comfort with professional audio quality, flexible microphone boom, and wide compatibility.

They come in monaural (one ear) or stereo / hi-fi (dual ear) versions, and some models include a 3.5 mm jack for mobile/tablet connectivity (in addition to USB).

They support Dynamic EQ, SoundGuard (audio protection), and easy controls (answer/end, mute, volume) built into the cable.

Specification

Feature	Typical / Range	Notes
Connectivity / Interface	USB-C (24-pin) (with tethered USB-A adapter)	Some models (3315, 3325) also include 3.5 mm jack
Microphone	Flexible boom, 280° rotation	135 mm typical boom length
Mic Frequency Response	100 Hz – 10,000 Hz	Optimized for PC wideband audio (~6.8 kHz)
Microphone Sensitivity	–38 dBV/Pa ± 4 dB
Speaker / Audio	Mono or Stereo (for hi-fi models)	32 mm drivers, 32 Ω impedance
Speaker / Frequency Response	For hi-fi stereo models: 20 Hz – 20 kHz	For voice mode: optimized ~200 Hz – ~6.8 kHz
Speaker Sensitivity	~94 dB SPL ±4 dB
Weight	Mono version: ~102 g (with inline control)	Stereo version: ~130 g (with inline control)
Controls / Buttons	Inline – call answer/end, mute, volume up/down	Microsoft Teams variant has a dedicated Teams button too
Audio Protection / Features	SoundGuard (limits > 118 dBA)	Dynamic EQ, anti-startle, TWA as per Blackwire family guide
Software / Compatibility	Windows, macOS – Poly Lens / Plantronics Hub support	Some softphones require software for full call control
Warranty	2-year limited warranty