At&t Dect 6.0 Digital Four Handset Answering System with Dual Caller Id, Call Waiting (Cl83464) Caller ID Announce - The handset and base audibly announce the name of the incoming caller. No need to find the handset to see who is calling. Makes screening calls that much easier. Full Duplex Handset and Base Speakerphone - Enjoy a speakerphone that can keep up with your calls. Increase participation by allowing both ends to speak-and be heard-at the same time for conversations that are more true to life. Message Retrieval from Handset Expandable System up to 12 Handsets (Uses CL80114 Accessory Handset), 50 Name and Number Phonebook Directory Redefining long-range coverage and clarity with a unique antenna design and advances innoise-filtering technology.