- Hear and be heard, loud and clear with Volume Boost control for amplified caller voice volume up to 40 dB, includes six voice Tone Settings and a loud base unit Ringer- Understand every word, every time more clearly with Slow Talk to slow the speed of speech in real time and when checking voice messages- Big white backlit LCD, enlarged Touch Dial Keys and controls, plus bright red LED visual ringers on base unit and handset enhance visibility and calling convenience- Hear calls from noisy places with Noise Reduction to suppress background noise interference for clearer, more comfortable conversation- Includes Power Backup, Talking Caller ID, Talking Keypad and Phonebook, 9 Speed Dials, 250-number Call Block, Accessories, and Expandable to 6 handsets