Designed for telephone professionals using either traditional or new wideband VoIP phone systems, the Vista M22 amplifier delivers precise levels of listening comfort, sophisticated hearing protection, and superior audio performance. It is compatible with most office phones* and offers new Clearline™ audio technology to enhance speech clarity—which helps to reduce repeats, errors, and listening fatigue. The Vista M22 is easy to use, with one-button headset/handset selection, plus controls for both incoming and outgoing volume. The Vista M22 adds value in traditional PBX systems, standard VoIP systems, and new wideband VoIP systems, protecting your investment through future tele-communications system upgrades.