AT&T SB67118 / SB67138 SynJ 4-Line Extendable Range Corded-Cordless + (3) SB67108 Cordless Handsets DECT 6.0 Technology (1.9GHz) - Interference-Free & Wide Range, 30% more Battery life 4-Line Operation & Expandable Up To 10 Handsets 3-Way Conferencing 100 Station Phone Directory / Dialer Bilingual Menu Support (English / Spanish)