BOSE SOUNDCOMM B40 HEADSET Single sided, right sided earphone/boom arm, 4- pin XLRF
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StarTech MUYHSMFFADW 3.5mm 4 Position to 2 x 3 Position 3.5mm Headset Splitter Adapter M/F - White Headphone Microphone Splitter - 4 pin / 4 pole - Walmart.com
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BOSE SOUNDCOMM B40 HEADSET Single sided, left sided earphone/boom arm, 4-pin XLRF
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Headset adapter with headphone/mic plugs - Audio Cables and Adapters | StarTech.com