Amplifies incoming sound up to 40dB; 4 tone settings for a customized listening experience; Amplified digital answering machine ; Large, high-contrast Caller ID display; Extra-loud & clear speakerphone for hands-free conversations; Large keypad with high-contrast numbers; 5 speed-dial buttons to store important numbers; 10 loud ringer melodies with 6 levels of volume; Caller ID display lights up as super-bright visual ringer; Expandable up to 4 cordless handsets (D703HS); 1-year limited warranty;