Pair this cordless accessory headset wirelessly with many AT&T DECT phones, including the Syn248 or SynJ business phone systems. Headset delivers up to 12 hours of hands-free talk time and crisp sound quality. DECT 6.0 digital technology offers a range of up to 500' to maximize mobility and provides superior quality of voice and sound, high protection against wiretapping while not interfering with wireless routers. A magnetic charger in the cradle ensures the headset fits and charges securely so you'll never run out of battery during long calls. Lightweight and comfortable, the headset offers multiple wearing styles: over the ear, over the head or behind the neck. Design also includes easy one-button answer. dual-color, lighted in-use indicator. sound level protection. six-level, audio volume control. ring-volume control and mute controls..