Thomson GE 28111EE2 DECT 6.0 Dual Handset Expandable System with Caller ID DECT 6.0 Technology - Digital wireless technology providing interference free, encrypted security Intercom - Allows convenient 2-way conversation between handsets or between handset to base without using the phone line VIP Ring Tones - Assign your favorite ring tones to family and friends. Allows specific ring tone to be attached to specific number stored in memory. When that number calls, the selected ring tone is played. Call-Waiting Caller ID - Display shows name and number of incoming call even if you're on the phone with another caller Handset Speakerphone - Provides convenience of hands-free communications Expandable up to 4 Handsets