USER GUIDEBlackwire™ C420
Registering Your Product OnlineVisit plantronics.com/productregistration to register your product online so we can provide you with the best possible
Installing Plantronics software For the ability to remotely detect and answer/end a call from your softphone application via the headset call control
3. Rotate the Boom for Storing in Case3.1 Rotate the boom up so it is aligned with the headband as shown.3.2 Fold the ear cushions flat as shown.3.3
Problem SolutionI cannot hear caller.• The USB headset is not set as the default audio device. Use the Audio settings in Windows under Sounds and Aud
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