The Gigaset CL390A Duo features a large, high-contrast display and impresses with two different acoustic profiles (high and low frequencies) for optimal voice and sound quality. The extra-large display allows for easy recognition of phone numbers and menus, and the phonebook can hold up to 150 entries. With call protection, up to 32 phone numbers can be blocked. The CL390A Duo includes a room monitoring function (baby monitor) with a two-way intercom, as well as a direct call function that allows stored numbers to be dialed with a single button press. The integrated answering machine allows callers to leave messages for up to 20 minutes.