PLANTRONICS M22 Amplifier + SupraPlus H261N Noise Canceling Headset COMPLETE he M12 Vista connects Plantronics headsets to just about any modular single or multi-line phone and offer ergonomically designed volume, headset/handset, and mute controls. Connects Plantronics headsets to most single or multi- line telephones. Easy to use one-button selection of headset or handset. Easy to use one-button selection of headset or handset. Separate controls allow independent adjustment of outgoing and incoming volume. Enhanced receive-side audio quality, intelligent flexible boom and stylish design provide greater headset flexibility. Noise canceling Monoaural headsets in very good condition with ear cushions &lt;li&gt; All-day wearing comfort and reliability.. Enhanced audio for greater listening accuracy