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2.5mm or 3.5mm Short QD to Headset Adapter Cord
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Amazon.com: 3.5mm Adapter Cable for All Plantronics and TruVoice QD Headsets - Connects with All Cell Phones and PC/Laptops with a Single 3.5mm Jack Port : Electronics
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Plantronics QD Plug to 2 X 3.5mm Female jack for Analog PC Headset to MX10 & M22 | eBay
PLANTRONICS 2.5mm to 3.5mm cable adapter/converter 84372-01
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