Plantronics 66735-01 Uni-Band Headband for CS50, CS55, CS50-USB, CS55H, CS60, CS60-USB, C65, AWH55, AWH65+ Cordless Headsets. CS60-USB, C65, AWH55,AWH65+. Plantronics CS50, Plantronics CS55, Plantronics CS55H and Plantronics CS60 Uniband Headband with ear cushions (also works with Plantronics M3500 Bluetooth Headset).
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