1. Product Overview
The POLY Blackwire C3210 is a wired monaural (single-ear) USB headset designed for clear communication and audio monitoring. It features a noise-canceling microphone and inline controls for ease of use in various environments, such as call centers or remote work setups.

Figure 1: POLY Blackwire C3210 Headset. This image displays the monaural headset with its adjustable headband, ear cushion, flexible boom microphone, and the inline control unit connected via a red cable to a USB-A connector.
2. Package Contents
- POLY Blackwire C3210 Headset
Note: The headset may arrive in protective retail packaging. Ensure all components are present upon unboxing.
3. Setup Instructions
3.1 Connecting the Headset
- Locate an available USB-A port on your computer (PC or Mac).
- Plug the USB-A connector of the Blackwire C3210 headset into the USB-A port.
- The headset is plug-and-play and should be automatically recognized by your operating system.
- Verify the headset is selected as the default audio input and output device in your computer's sound settings or communication application (e.g., Skype, Zoom, Microsoft Teams).
3.2 Wearing the Headset
- Adjust the headband to fit comfortably over your head.
- Position the ear cushion over one ear.
- Gently bend the flexible boom microphone so that it is approximately two finger-widths from the corner of your mouth. Ensure the microphone is positioned on the same side as the earpiece.
4. Operating Instructions
4.1 Inline Controls
The Blackwire C3210 features an inline control unit on the cable for easy management of calls and audio.
- Volume Up (+) Button: Press to increase listening volume.
- Volume Down (-) Button: Press to decrease listening volume.
- Mute Button (Microphone icon): Press to mute or unmute the microphone during a call. An indicator light on the control unit may show the mute status.
- Call Control Button (Phone icon): Press to answer or end a call when connected to a compatible softphone application.
4.2 Audio Usage
- The headset provides mono sound for listening to audio or telephone calls.
- The noise-canceling microphone is designed to reduce background noise for clearer outgoing speech.
5. Maintenance and Care
- Cleaning: Use a soft, dry cloth to clean the headset. Do not use liquid cleaners or immerse the headset in water.
- Storage: When not in use, store the headset in a clean, dry place. Avoid extreme temperatures.
- Cable Care: Avoid sharp bends or excessive pulling on the cable to prevent damage. The cable is fixed and not designed to be retractable.
- Ear Cushions: Periodically check ear cushions for wear and tear. Replacement cushions may be available from the manufacturer.
6. Troubleshooting
| Problem | Possible Solution |
|---|---|
| No sound from headset |
|
| Microphone not working |
|
| Call control buttons not responding |
|
7. Specifications
| Feature | Detail |
|---|---|
| Brand | POLY |
| Model Name | BLACKWIRE C3210 USB-A |
| Item Model Number | 209744-22 |
| Connectivity Technology | Wired (USB-A) |
| Headphones Jack | USB |
| Ear Placement | Over Ear (Monaural) |
| Form Factor | Over Ear |
| Microphone Type | Boom, Noise Cancelling |
| Frequency Range | 20Hz - 20kHz |
| Control Type | Volume Control, Touch (Inline) |
| Item Weight | 87 Grams (3.07 ounces) |
| Product Dimensions | 2 x 4 x 8 inches |
| Material | Plastic |
| Color | Black |
| Included Components | Plantronics Blackwire C3210 Headset |
| Recommended Uses | Calling, Audio Monitoring, Call Center |
| UPC | 017229162723, 197497211146 |
8. Warranty and Support
For warranty information, please refer to the documentation provided with your purchase or visit the official POLY website. POLY offers support resources including FAQs, drivers, and contact information for technical assistance.
Online Support: www.poly.com/us/en/support





