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Plantronics USB Audio Adapter to Dual 3.5mm Female Jacks for Headset to Computer 503358802840 | eBay
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Amazon.com: Headset QD(Quick Disconnect) Connector to USB Adapter Cable with Volume Adjuster, Mute for Speaker and Microphone Separately Compatible with Any Plantronics and VoiceJoy Headset QD Plug : Electronics
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RJ9 Phone Headset - Plantronics Compatible QD Headset + Virtual Compatibility Smart Adapter for Cisco Avaya Nec and Most Phones - Walmart.com
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Plantronics Encore PRO Mono Wideband Headset | HW710 (HW291N) | 78712-101 | For Nortel, Polycom, Cisco, Mitel, Avaya, ShoreTel and other business phones | Requires Adapter
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