The AT3 is a telephone amplifier for phone systems requiring a PJ 327 Plug Prong interface. Features include mute and no mute version, full range volume controls, voice switching to eliminate background noise when user is not speaking and FailSafe™ compression to provide a constant output level with varying input signals; boost the weak and reduce the strong, a patent pending circuit that prevents clipping and distortion as well as safe guards the user against acoustic spikes, field replaceable headset cord and unique 90° bendable housing to minimize space usage. Available with or without mute.

New: 2-year Factory warranty