Panasonic KX-TG6072B 5.8 GHz Expandable Digital Cordless Answering System with 2 Handsets Cordless system includes digital answering machine and 2 handsets for extra convenience For less interference, uses 5.8 GHz frequency band and frequency hopping spread spectrum technology Digital answering machine with 18 minutes recording time Digital duplex speakerphones built into back of both handsets for clear conversations Call-waiting caller ID shows who's calling even while you're on call