This is the Replacement or Spare Cable Assembly, Remote for the  Poly CA22CD-SC Wireless Headset PTT system.

Important Note:  This part  is NOT compatible with the original CA12CD or CA12CD-S or CA22CD-DC

Old Poly part # 217102-11

New HP part # 920P5AA

*Important Note on Returns: Due to the manufactures policy, this is a special order item.  All Sales are FINAL.  It's not returnable, not refundable under any circumstance.  If it's defective, Plantronics will replace it for you under warranty