Plantronics. Audio 340 Headset W/ Full Range Stereo, Noise Canceling Microphone Plantronics AUDIO 340 Behind-The-Head Multimedia Computer Gaming Headset. Plantronics.Audio 340 Stereo Analog Computer Headset W/ Full Range Stereo, Inline Volume, And an Adjustable Noise Canceling Microphone. Full-range stereo sound engulfs listeners in audio bliss. Inline volume and mute provide convenient access and control. Noise-canceling microphone for clear conversations in any environment QuickAdjust telescoping, bendable boom assures ideal microphone placement Sleek, affordable comfort Soft ear cushion for all-day comfort.