Poly 3325 Blackwire USB-A Stereo headset for Windows or Apple Mac.  Poly Blackwire 3325 soft leatherette ear cushions. Dynamic EQ for perfect sound level.  Compatible with all major UC sofphones from Cisco, Avaya, IBM, etc. Poly Blackiwre 3325 also includes a 3.5mm adapter compatible with many smart devices or cell phone. 

Key Features:

• USB-A headset including a 3.5mm jack
• Leatherette ear cushions for all day use
• Adjustable 180-degrees speakers
• Flexible boom arm
• Apple Mac OS and Windows PC compatible
• Noise-canceling mic to block out background noise
• Sound spike EQ protection in case loud noise from the source.

Old Poly part # 213938-101

New HP part # 76J20AA

For more detail information, see Plantronics Blackwire 3325 USB-A datasheet

Blackwire Accessories:

Plantronics Blackwire Travel Case