Panasonic KX-TG5634M 5.8 GHz FHSS GigaRange Digital Cordless Answering System with Four Handsets 5.8 GHz frequency-hopping digital spread spectrum technology Call Waiting Caller ID with 50-station memory; 50-station permanent phone book All-digital answering system with access from handset or outside line Customizable ringtones include melodies, tones and downloads Package includes four handsets, one base and three charging cradles; One-year warranty