With Panasonic’s KX-TGA450B 5.8 GHz 4-Line Digital Cordless Handset, you can add additional handsets to your existing telephone system. You can put one in the den, the kitchen, the master bedroom and the living room—all while using only one base and one phone jack—so you won’t have to make a run for it when the phone rings. Some of the many features include Hearing Aid Compatibility (HAC), Caller ID, Call Waiting and an answering system.