The Clarity C440, featuring Clarity® Power technology, makes phone conversations not only louder, but also clearer and easier to understand. Features Clarity® Power technology Amplifies incoming sounds up to 30 decibels 2.4GHz technology for more freedom of movement Type I and Type II Caller ID with 50 number and name memory Bright visual ringer in base and handset alerts users to incoming telephone calls Customizable handset ringer Large lighted dial pad