AT&T E580-2 Accessory Cordless Handset, Silver | Requires a E5800 and E5900 Series Expandable Phone System to Operate 5.8 GHz frequency-hopping digital spread spectrum signal For use with E5860, E5865, E5900B, and E5965C expandable phone systems Caller ID/call waiting, 50-call history; image ID; personalized ringer 50-number phone directory; intercom, conferencing, call transfer Graphical color LCD; handset speakerphone and message retrieval