The AT&T SL82318 DECT 6.0 Corded/Cordless Phone with Three Handsets and Answering System offers unsurpassed range, sound quality, and security, thanks to its use of DECT 6.0 technology, a newly available frequency band that does not suffer from interference from home appliances and wireless networks. The system comes with three handsets; you can transfer calls between handsets, and all three handsets can be off-hook simultaneously.It also expands upto the base and it can support up to 12 separate handsets. A built-in digital answering machine system records messages on microchips for reliable performance, instant access to messages, and the ability to selectively save and delete messages. The phone supports caller ID and call waiting. The Speakerphone is built right into the handset, making it more convenient than having to sit by the base as many other Speakerphone systems require. You can select from various ringtones, and the phone system is wall-mountable.