Poly - Plantronics .Audio DSP-400 alternatives, similar headphones

A4tech HS-50
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A4tech HS-7
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A4tech HS-60
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Hama HK-275
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Hama PC Headset HS-70
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Panasonic RP-WF940E-S
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LG HBM-510 Prada
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Poly Voyager 520
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Shure SE530
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Jabra BT3010
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BLUETREK G3
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JVC HA EB70D
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Poly - Plantronics .Audio 480
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Poly - Plantronics .Audio 610 USB
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Poly - Plantronics .Audio 625 USB
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Poly - Plantronics .Audio 645 USB
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Poly - Plantronics .Audio 650 USB
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Poly - Plantronics .Audio 470 USB
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Poly - Plantronics .Audio 770
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Poly - Plantronics .Audio 750 DSP
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Poly - Plantronics .Audio 480 USB
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Poly - Plantronics SupraPlus Wireless CS361N Spare Headset
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Poly - Plantronics SupraPlus DIGITAL D251
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Poly - Plantronics SupraPlus DIGITAL D251N
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