The Uniden DCX400 2-Line Accessory Handset and Charger is a perfect accessory phone for the DECT4000 Series. It runs with DECT 6.0 technology for superior quality and range. The blue backlit keypad and LCD are easy to see, even in the dark! You can use the alarm clock on this phone to schedule reminders. Hold up to 100 x 2 phonebook entries and search through them alphabetically. The voicemail waiting light on the handset tells you when you have a message and you can access those messages from this handset. Speakerphone, caller ID and call waiting are also available on this handset. The phone is headset compatible. Intercom or transfer calls between handsets. Use the personal ring tones to match your personality. Trilingual menus come in English, Spanish and French.