Poly Plantronics Blackwire 3325 Stereo USB Headset with 3.5mm
The Blackwire 3325 covers both ears and travels
Your desk calls come through the computer and your other calls come through your phone, and you'd rather not own two headsets to handle them. The Poly Blackwire 3325 is built for exactly that split. It's the stereo headset in Poly's 3300 series with a 3.5mm connector added, so the same headset that blocks out the open office on a Teams call also plugs into a phone on the move.
It's the last piece of the 3300 lineup — the mono desk model is the Blackwire 3310, the mono hybrid is the 3315, the stereo desk model is the 3320, and the Blackwire 3325 is the stereo hybrid: both ears, both devices. It comes in USB-A and USB-C, each available as a standard UC model or Microsoft Teams certified.
Build the exact Blackwire 3325 you need
Four versions, split by two choices: which USB port matches your computer, and whether you want the dedicated Microsoft Teams button. Every version includes the 3.5mm connector.
- USB-A, UC (76J20AA). The standard USB-A plug for most desktops and older laptops. Works with every major softphone. The everyday office pick.
- USB-A, Microsoft Teams certified (76J21AA). Same USB-A connection, plus a dedicated Teams button for one-press meeting access. The pick for a Teams-first office on USB-A.
- USB-C, UC (76J22AA). The USB-C plug for newer laptops, MacBooks, and USB-C devices. Same softphone compatibility as the USB-A version.
- USB-C, Microsoft Teams certified (76J23AA). USB-C with the same dedicated Teams button. The pick for a Teams-first office on newer hardware.
Stereo isolation and a phone jack, on one Blackwire 3325
The Blackwire 3325 covers both ears, which gives you passive isolation — the cushions physically block a good deal of room noise — plus true stereo, so it plays music and video properly between calls, not just voice. That's not active noise cancellation; there's no electronics erasing the office, just both ears covered by soft leatherette cushions built for a full day of wear. And because it carries a 3.5mm connector alongside the USB connection, the same Blackwire 3325 that ran your desk call over Teams plugs into a phone the moment you're out the door.
Both ears blocked, true stereo for media, plus mobile connectivity. For anyone whose calls come from both a computer and a phone.
Same both-ears isolation and media playback, but no 3.5mm — desk calls only, at a lower price. Fine if every call runs through the computer.
Will the 3.5mm jack fit your phone?
The Blackwire 3325's 3.5mm connector works with any phone or tablet that still has a 3.5mm headset jack. It won't work directly with a phone that's dropped the jack in favor of USB-C or Lightning only — and that's most current iPhones and a growing share of newer Androids.
Microsoft Teams certified, or not — what actually changes
Every Blackwire 3325 works with Microsoft Teams. What Teams certification adds is a dedicated button on the inline controls — one press brings Teams to the front, joins or answers a meeting, checks notifications — plus Poly's tested Teams audio profile. The standard UC version runs Teams fine without it, and works with Zoom, Webex, Avaya, and Cisco just the same.
The Blackwire 3325 is the headset for a workday that doesn't stay at one desk — both ears covered for focus on the computer, a real stereo mix for the music that gets you through the gaps, and a 3.5mm jack ready the second you switch to the phone. Pick your USB port and your certification, and it's plug-and-play on both sides, backed by HeadsetPlus's lifetime support.
- Poly Blackwire 3325 stereo headset with inline control module
- USB connection to your computer (USB-A or USB-C, depending on version)
- 3.5mm connector for mobile phones and tablets
- Leatherette ear cushions (fitted, both ears) and quick start guide
The inline module handles answer/end, volume, and mute on every version. The Microsoft Teams-certified versions (76J21AA, 76J23AA) add a dedicated Teams button.
| Type | Stereo (both-ear), over-the-head, on-ear |
|---|---|
| Series | Blackwire 3300 Series |
| Connection | USB-A or USB-C to computer, plus a 3.5mm connector for mobile phones and tablets; inline control module |
| Controls | Inline answer/end, volume, mute; dedicated Microsoft Teams button on the Teams-certified versions |
| Microphone | Flexible noise-canceling boom; 180° rotation for a custom fit |
| Audio | PC wideband voice plus hi-fi stereo for multimedia; Dynamic EQ auto-switches between voice and media |
| Noise handling | Passive isolation from covering both ears (not active noise cancellation); noise-canceling microphone for outgoing voice |
| Hearing protection | SoundGuard acoustic limiting above 118 dBA |
| Comfort | Padded headband; leatherette ear cushions on both ears |
| Weight | Approx. 96 g (headset); around 130 g including inline control |
| Software | Poly Lens / Plantronics Hub (Windows and Mac) |
| Certification | UC versions work with all major softphones; Microsoft Teams-certified versions add a dedicated button (both work with Teams) |
| Part numbers | USB-A UC: 76J20AA (old 213938-101); USB-A Teams: 76J21AA (old 214016-101); USB-C UC: 76J22AA (old 213939-101); USB-C Teams: 76J23AA (old 214017-101) |
| Warranty | 2-year manufacturer warranty, plus HeadsetPlus lifetime technical support |
Software. The Blackwire 3325 works with every major softphone and UC platform — Microsoft Teams, Zoom, Webex, Avaya, and Cisco among them — on both Windows and Mac. Poly Lens (Plantronics Hub) manages settings and firmware. The Teams-certified versions add a one-press Teams button; the UC versions run Teams the same, without it.
Hardware. The headset connects to a computer over USB-A or USB-C, depending on the version, and to a mobile phone or tablet over 3.5mm — but only devices that still carry a 3.5mm headset jack. Phones without one need an adapter. The inline module carries the call controls.
Platforms. The Blackwire 3325 suits hybrid and mobile workers moving between a computer and a phone, open-plan offices where blocking the room matters, and large VoIP deployments that want one comfortable, portable stereo headset across the fleet.
FAQ
Frequently Asked Questions
The Blackwire 3325 is the stereo Blackwire 3320 plus a 3.5mm connector for phones and tablets. Both cover both ears for passive isolation and true stereo media playback; the 3325 adds mobile connectivity for anyone who splits calls between a computer and a phone.
It's available both ways. The Microsoft Teams-certified Blackwire 3325 adds a dedicated Teams button for one-press meeting access; the standard UC Blackwire 3325 works with Teams and every other major softphone just as well, without the button.
Yes, through its built-in 3.5mm connector — but only with phones and tablets that still have a 3.5mm headset jack. Many recent phones, including most current iPhones, have removed it and need a USB-C or Lightning adapter to use the Blackwire 3325's jack.
Match it to your computer's port. Choose USB-A for most desktops and older laptops, and USB-C for newer laptops and MacBooks. Both connect to mobile devices the same way over 3.5mm, with identical audio and softphone compatibility.
No. The Blackwire 3325 uses passive isolation from covering both ears, not active noise cancellation. Its microphone is separately noise-canceling for outgoing voice, but neither feature electronically blocks room noise the way ANC headphones do.
The Blackwire 3325 weighs about 96 grams for the headset alone, or roughly 130 grams including the inline control module — light enough for all-day wear despite covering both ears.