2-Line Integrated Phone System with Intercom, Hearing Aid Compatible (HAC), Call Waiting Caller ID and Speakerphone, Black...With two-line operation, you can conference in two outside lines to have a three-way conversation. Or place your current call on hold to make another call. Being able to use two phone lines with just one phone makes it convenient and efficient to manage your calls. So you're going out with two of your friends tonight, but you're having trouble deciding where to go. Make it easy on yourself and talk to both of them at the same time. With up to 3-way conferencing, you can talk to two outside lines at the same time. We've all become accustomed to Caller ID and its ability to let us see who's calling before we answer the phone. Then there's call waiting, a beep letting us know there's another call coming in. But until now, you wouldn't know who was beeping in unless you answered it. With Call Waiting Caller ID1 you get the best of both worlds. Now when you get a beep, you can see who's calling before you answer. But we'll leave that decision up to you! The LCD Display shows call status, programming options, directory items, and if you subscribe, up to 3 lines of Caller ID information-so there's no need for scrolling. This phone system can be hung on a wall to free up desk or counter space. This is especially helpful in kitchens or offices, where desk and counter space is at a premium.