The Siemens Gigaset S820 is a high-end cordless phone system that offers a range of advanced features and functionalities. It features a large color touchscreen display, which allows users to easily navigate through menus and access various functions. The phone also comes with a built-in answering machine, caller ID, and a phonebook that can store up to 500 contacts. Additionally, the S820 supports Bluetooth connectivity, allowing users to pair it with their mobile devices and make and receive calls using their mobile number. Overall, the Siemens Gigaset S820 is a powerful and versatile phone system that is ideal for both home and office use.