Poly SupraPlus SDS 2609-01 is a special modified Poly HW251N with a dynamic noise-canceling microphone for super clear, uninterrupted voice transmission. Poly SupraPlus SDS 2609-01 has a Plantronics quick disconnect (QD) end. Poly SupraPlus SDS 2490 headset is designed for important, mission-critical applications.
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