The Gigaset S820H is a second device to my Gigaset SX810 ISDN. I find it very reason konfortabel because all addresses and telephone numbers, including birthdays from the main unit SX810 can be loaded or even directly from Dektop from Outlook. It has features like a good phone, such as missed calls. The handling is easy and the buttons are large enough to easily operated by older people. The speech comprehension is excellent for me as a bilateral hearing aid users. This was the purchasing decision for me.