Plantronics Vista M22 Amplifier The Plantronics always come up in front with some new technology, innovation, and life-changing product. The Plantronics Vista M22 Amplifier is one of the new inventions in the field of the headset by Plantronics. The Plantronics M22 Amplifier is one of the best audio processors, especially for VoIP users. It has the ability to auto control the voice level which comforts your ears, hearing proper protection with high-quality performance. The Plantronics M22 Amplifier has the feature which makes you listen in the noise-free environment and works best with wideband VoIP. The elegantly designed with volume control and mute option. It is known to be the universal compatible audio processor with telephones and others. Plantronics Vista M22 Amplifier Features Phone Headset Amplifier w/ Clearline and Audio Technology Echo Management for Clearer Calls Protection from Loud Noises Reduces Background Noise Supports VoIP Phones Handset / Headset Volume Controls Mute Adjustable Incoming / Outgoing Volume Switch Between Headset and Handset For Use w/ Office Telephones Connects to Most Single / Multi-Line Phones Lightweight 10-ft Coil Cord