Plantronics 2.5mm to RJ9 Adapter Cable

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This is the Plantronics 2.5mm to RJ-9 adapter cable Key Features: Allows phones with 2.5mm headset jacks to wireless headset systems* You may also use this 2.5mm cable with a M22 a mplifier to amplify calls with any phones with 2.5mm jack. (just replace the pig tail cable on the M22 amplifier) Old Poly part # 78333-01 New HP part # 85R36AA Important Note: Not compatible with the Plantronics CS500 and Savi 700 series wireless headset models. Show more