Replacement? SS classic clear voice tube for Plantronics H31, H41, H51 and H61 model headsets.? This microphone tube extension is required for crisp, clear communication when using a headset.? The SS classic was the original voice tube by Plantronics and is at a 90 degree angle and slightly longer than the current version.? It? is recommended by the Plantronics, the manufacturer, to be replaced every 6-month.
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