AT&T Dect 6.0 Extended Range Cordless Headset Dect 6.0 Extended Range Cordless Headset offers SRS sound-enhancing technology, extended range, connection to headset port or PSTN, 12 hours talk time and conference capability up to two headsets. Comfortable, lightweight design includes over-the-ear, over-the-head and around-the-neck wearing options for either ear. Electronic hook switch compatible. Includes lifter kit.