The C530 was designed for families. The telephone has a color display with backlight, which makes it easy to control. You can personalize the C530 by choosing a special ringtone for friends and relatives. That way, you always know who's calling. There's plenty of space for all your contacts in the extensive address book, which allows you to store up to 150 numbers. It's also possible to make internal calls with other family members in the house. Thanks to HSP sound technology, all your calls benefit from good sound quality.