Uniden CellLink ELBT595 5.8 GHz Digital Expandable Cordless Flip Phone with Color LCD, Answering System, and Bluetooth Capability (Titanium) 5.8 GHz digital signal; expandable up to 10 handsets, 1 included Digital answering machine, 15-minute maximum recording time Bluetooth enabled for wireless headsets and compatible mobile handsets Recordable ringtones; full-color LCD on handset Caller ID/call waiting; dual keypads, base and handset speakerphones