The Clarity D704 40 dB amplified cordless phone is full of features for the convenience of the user. Clarity's patented hearing technology, Clarity Power, makes hearing easy again by minimizing background noise, eliminating feedback and distortion, and managing soft/loud sounds to produce clarity. It even amplifies incoming sound up to 40 decibels. This phone has more then just the biggest buttons that are easy to see, this thoughtful design delivers clearly visible numbers, contoured keys with soft-touch material, backlit keypad, and large font caller ID Screen. The extra loud and clear handset speakerphone, 10 speed dial buttons, 100 names and number phone book, and 20 last number redial memory are only a few of the additional features that showcase Clarity's 40 years of innovation. This phone is fully hearing aid compatible.