VTech VT-20-2431 Remanufactured 2.4 GHz DSS 2-Line Expandable Cordless Phone with Caller ID Silver/Black, 2.4 GHz digital spread spectrum signal, Expandable to 8 handsets, 1 included Caller ID with call waiting, 50-call history; 50-number phone book, Base and handset speakerphones, Wall mountable; headset compatible.