Digital cordless technology. Less interference. Exceptionally clear sound. Plus now you can easily put additional handsets in any room of the house, even the garage--and with the built-in intercom functionality, everyone is connected. Build up to a 4-phone system with 1 phone jack, and create the cordless system that works best for you. Caller ID/call waiting compatible, the MD481 holds up to 40 numbers in its internal caller ID memory, and also features a 99-number phone directory (50 per handset, 49 shared) to help you keep track of important numbers. Speakerphones are provided on both the base and the handset, and a headset jack allows you to connect an optional headset for mobile, hands-free communication. A room monitor mode lets you hear what's going on at another handset location, while another mode lets you use the handsets as walkie-talkies. A page/handset locator makes finding a lost handset quick and easy, and a low-battery indicator lets you know when to return the handset to its cradle to recharge. The all-digital answering machine has one mailbox, which comes with a 15-minute maximum recording time. A memo feature lets you record notes such as driving directions for later recall, while remote operation lets you check your messages while you are away.