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Amazon.com: Headset Adapter Cable 3.5mm Smartphone Headset to RJ9/RJ10 Phone Adapter for ONLY Cisco 7940 7970 7960 6900 8900 Series Phones : Electronics
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RJ9 Female 2.5mm Male Adapter | Plantronics Headset to Cordless Phone Connector Cable
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Aviation Headset Bluetooth Adapter for Cell Phone/Music
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Wireless Phone Headset Adapter
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