Uniden DECT 1060 DECT6.0 Expandable Cordless Phone System with Call Waiting/Caller ID DECT 6.0 Interference Free Cordless Frequency - (1.9 GHz Digital Enhanced Cordless Telecommunications) V-Quad Technology (4 Way Voice Enhancer) and Conference Call - You can hold a 3-way conversation (conference call) between your handset, an external caller and another internal handset user. Handset Speakerphone - This feature gives you the freedom to use the handset as a speakerphone. Transfer phonebook memory between handsets Interference Free, Expandable