AT&T TL86109 + (3) TL86009 5 Handset Corded / Cordless (2 Line) DECT 6.0 New DECT 6.0 Technology - Interference Free Communication - Increased Clarity / Enhanced Security - Wider Range / Network Friendly 1.9GHz Corded / Cordless Phone Combo 2-Line Operation. Hearing Aid Compatible. RoHS Compliant Expandable Up To 12 Handsets Dual Keypad (Base & Handset)