Blackwire 600 Series Family consists of 4 models
81964-42 - C610 - Standard monaural USB headset
81965-42 - C620 - Standard binaural USB headset
81272-42 - C610-M - Monaural headset optimized for Microsoft Office Communicator 2007
79930-42 - C620-M - Binaural headset optimized for Microsoft Office Communicator 2007
Wideband - Up to 6,800Hz
Stereo (binaural versions only)
Digital Signal Processing (DSP)
Adjustable ear cushions
Swiveling Quick Adjust microphone boom
Call answer/end mute and volume controls
Two year warranty
To Adjust the Mouthpiece
Hold the receiver securely against your ear with one hand. With your other hand, adjust the clickstop turret and the microphone so that the tip sits two finger- widths from the corner of your mouth. To prevent breath noise, avoid putting the microphone in front of your mouth (see figure 3.1 above).
Carefully bend and shape the boom with both hands as shown in figure 3.2, above. Avoid bending or twisting the boom near the microphone or earpiece.