The Clarity E814Cc Is An Amplified Corded/Cordless Combo With Digital Answering Machine That Amplifies Incoming Sound Up To 40 Decibels With Four Tone Settings To Customize Your Listening Experience. Large High Contrast Cid Display, Large Keypad, Five Speed Dial Buttons. Ten Loud Ringer Melodies With Six Levels Of Volume. Can Be Expandable Up To Four Cordless Handsets That Must Be Ordered Seperately.