The WIR 150 Listening System is a personal amplification system designed for use by individuals who are hard of hearing. Designed for listening to television or for use in small group meetings, offices, or in conference rooms, the system can be used with the included microphone or plugged into the television or sound system audio output jacks. The set includes the microphone, a transmitter, and a one-piece stethoscope-style receiver. OPTIONS: A Lavalier-style receiver, an additonal stethoscope-style receiver, a headset-style receiver, and an additonal transmitter. DIMENSIONS: Operates over an area of approximately 400 square feet. WARRANTY: Five years.