The TeleTalker® is specifically designed to improve speech understanding over the telephone. It combines a powerful amplifier with a sophisticated signal processing circuit to enhance phone signal quality. Large Keyboard buttons makes dialing and operating phone easier for individuals with Macular Degeneration, AREDs or visual impairments. Simple, Easy-To-Use Using the TeleTalker® is as easy as using a conventional phone. To enhance or amplify a call, press the Amplify button, then adjust the volume and enhancement controls for maximum comfort and clarity. When you hang up, the TeleTalker® automatically returns to normal operation, protecting others from unintended amplification. Improves Speech Understanding The TeleTalker® lets you boost the high frequencies as needed to emphasize speech sounds that contribute to maximum understanding. Amplified Sound Without Feedback The sophisticated anti-feedback circuit permits full use of amplification without problems of distortion, howling, or feedback - a Williams Sound exclusive! Hearing Aid Compatible The TeleTalker® can be used with a telecoil-equipped hearing aid coupled with the handset speaker. The Williams Sound Warranty: Your Assurance Of Quality The TeleTalker® comes with a 5-year warranty, your assurance of both quality and satisfaction