The Best Wireless Headset For Your Home Office
plantronics-cs540
Plantronics CS500, Plantronics CS540, wireless headset, plantronics
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Plantronics CS500 Series Configuration Switch Adjustment

Look at the bottom panel of your base to locate the configuration…
Jabra_Pro9450_Flex, wireless headset
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Jabra PRO 9450 Manufacture Date Location

Jabra PRO9450 wireless headset includes manufacturer's 1 year…