The XK-TG9581B expandable Digital Enhanced Cordless Telecommunications (DECT) 6. 0 Phone system with an answering machine and 1 cordless handset allows you to link up to four cells or smartphones and integrate them into the phone system via Bluetooth. Includes one corded handset on the phone's base unit and two additional cordless handsets, expandable up to twelve handsets (additional handsets sold separately).