Special order item. Call for availability. 

Poly SHR 2639-01 Stereo Circumaural Headset with a TA6ML connector. Tough enough for use anywhere, including the US Navy. Circumaural headset delivers clear communication in high noise environments and mission critical applications.

Key Features:

• Dual Channel TA6ML connector 6 pin
• Over the head noise canceling, Dual Ear Circumnaural Headset
• Premium headset for mission critical applications.
• 22dB noise reduction for the ear cups
• 20dB noise reduction for the microphone
• Soft cushion Headband.

Old Poly part # 92639-01

New HP part # 8K7E0AA#AC3

 For more details and technical specs: See Poly SHR 2639-01 datasheet

*Important Note: Due to the manufactures policy, this is a special order headset.  It's not returnable, non-refundable.  If it's defective, Plantronics will replace it under warranty