Interference-free DECT 6.0 cordless phone; Large backlit display makes it easy to see Caller ID; Handset speakerphone allows hands-free communication; Phone book stores up to 30 names & numbers; Makes internal calls， transfers external calls， holds 3-way conversations & more; 3 Languages; 5 standard ring tones & 4 polyphonic ring tones; Phone system is expandable up to 5 handsets; Single-handset system;