[. . . ] BlackwireTM C210-M Blackwire C220-M U SER GU ID E Welcome Welcome to the Plantronics family of headset products. Plantronics provides a wide range of products from mission-critical and business-critical applications to personal communications and entertainment. [. . . ] The foam cushions should sit comfortably over the centre of your ears. Headset Features 3 3. 1 Adjustable Headband 1 Ear Cushion Receiver 3. 2 Boom 3. Adjust the Boom and Microphone Headset Cord Noise-Cancelling Microphone 3. 1 Rotate the boom so it is aligned with your mouth. 3. 2 Shorten or lengthen the microphone so it is approximately two finger widths from the corner of your mouth. 4 5 Using Your Headset Answering/Ending/Making Calls with Microsoft Office Communicator To make a call, select a contact or dial the number via Microsoft Office Communicator. To answer or end a call, simply press the call answer end button. Troubleshooting Problem I cannot hear caller. Solution · The USB headset is not set as the default audio device. To change audio setup, refer to the Microsoft Office Communicator user guide. Use the Voice settings in Windows under Sounds and Audio Devices to select "Blackwire C210-M/C220-M" as the voice device. · Lower the listen volume on your softphone until the distortion disappears. The other headset I was using to listen to music does not work any more. · The USB headset will set itself as the default audio device in Windows. Use the Audio settings in Windows under Sounds and Audio Devices to change the device used for audio. · When a PC goes into standby or hibernation, the USB headset no longer is powered on. [. . . ] Plantronics, the logo design, Blackwire, and Sound Innovation are trademarks or registered trademarks of Plantronics, Inc. Microsoft is a registered trademark or trademark of Microsoft Corporation in the United States and/or other countries. [. . . ]