This 5.8GHz digital cordless phone system is packed with a ton of great features to make communication ultra easy. Expandable up to 12 phones/devices (each sold separately) it features a built-in digital answering machine and is equipped with Caller ID# and visual Call Waiting#. It lets you download up to 20 different ring tones and it has a speakerphone, room monitor, voice-mail message forwarding function, caller message screening/large message alert and it has a battery backup for use during a power failure (batteries sold separately).