2002-1-16 2007-2-18 Now there's an easy answer to all your hands-free communication needs: the Plantronics M12 Vista Telephone Headset Amplifier. The M12 works with your choice of Plantronics headsets to deliver the precise level of comfort, audio performance, and hands-free convenience that's just right for each user and every application. Compatible with almost all phone systems and a variety of Plantronics headset styles. Separate controls permit independent adjustment of transmit and receive volumes. Easy one-button select for headset or handset function. SoundGuard PlusTM and Call Clarity technology sets a new standard for sound quality. Automatic gain control system keeps in-coming sounds at comfortable hearing levels. 91268 text/html 1.0 EN M12 Vista Telephone Headset Amplifier Headset Adapters Headset Express Loracomm Headset Plantronics Adapter M12 Vista Telephone Headset Amplifier text