AT&T SB67138 + (3) SB67148 with Free Range Extender 5 Handset Corded / Cordless Phone (4 Line) New DECT 6.0 Technology - Interference Free Communication, Increased Clarity / Enhanced Security, Wider Range / Network Friendly Up To 3-Way Conferencing Expandable Up To 10 Handsets Music On Hold Compatible Bilingual Menu Support (English / Spanish)