AT&T SB67138 SynJ 4-Line Extendable Range Corded-Cordless Phone System with 4 Extra Handsets and DECT 6.0 Range Repeater DECT 6.0 Technology 1.9GHz Corded/Cordless Phone 30% Battery Life Increase Over 5.8GHz 4-Line Operation Caller ID/Call Waiting