Dect 6.0 Technology; Expandable Up To 12 Handsets; Caller Id; Handset & Base Speakerphones; Answering Machine Mailbox For Each Line; Transfer & Intercom Between Handsets; Dual Keypad;additional Handset For Vteds6151; Dect 6.0 Technology; Handset Speakerphone; Caller Id; Intercom & Transfer Between Handsets