Special Features:

The vista m22 amplifier delivers precise levels of listening comfort, sophisticated hearing protection, and superior audio performace; includes clearline near-universal compatibility with single and multi-line telephones as well as ergonomically designed volume, headset/handdet and mute controls; quick disconnect feature between the amplifier and headset allows movement away from the base unit without removing headset or disconnecting the call; comes with a lightweight 10-foot coil cord for freedom of movement; a headset must be used with the m22

Properties:

An item having the dual functions of a loudspeaker (as modified) and an amplifier, audio frequency. may include volume control, on/off switch, connecting facilities, mounting hardware and/or an enclosure.