Vista M22 Amplifier with Clearline audio. Ideal for professionals- particularly VoIP users- the Vista M22 amplifier delivers precise levels of listening comfort sophisticated hearing protection and superior audio performance. The Vista M22 includes Clearline audio to improve call quality in any environment especially wideband VoIP. The amplifier includes near-universal compatibility with single and multi-line telephones as well as ergonomically designed volume headset/handset and mute controls. The Quick Disconnect feature between the amplifier and headset lets you move away from your phone without removing your headset or disconnecting the call. The Vista M22 comes complete with a lightweight 10-foot coil cord for freedom of movement at your desk.