This Spare Headset is NOT compatible with CS510 / W710 / WO300 / W410 USA / Canada DECT 6.0 Systems. Plantronics WH300/A Monaural. Plantronics Savi CS510/A, W710/A, WO300/A. DECT Wireless Headset. Plantronics Savi CS510/A & W710/A.
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