Panasonic 5.8Ghz Expandable Digital Cordless Answering System - 4 Handset System (KX-TG4324B) Versatile and easy to use 5.8 GHz expandable digital cordless answering system Call waiting; caller ID2; night mode with light-up indicator All-digital answering machine; built-in clock with alarm on handset 50-station shared phonebook; digital handset speakerphone Rechargeable Ni-MH handset battery for five hours of talk time with 11 days of standby time