The ATH-SR30BT wireless over-ear headphones deliver the exceptionally pure audio of Sound Reality in a convenient wireless design. With exclusively designed 40 mm drivers and a dual-layer isolation housing structure that optimizes phase and transient response, you'll enjoy powerful, full-range audio reproduction from a Bluetooth® wireless signal. What's more, the internal battery provides a remarkable 70 hours of continuous use on a full charge, so, for all practical purposes, the music never has to stop! The ATH-SR30BT headphones are equipped with a mic and controls in the left earcup, making it easy to answer calls, adjust volume and handle music playback on smartphones and other devices. Soft memory foam earpads and headband ensure a comfortable fit, and, when not in use, the headphones fold flat for easy storage and portability. The headphones come with a 30 cm (1.0') USB charging cable, and are available in charcoal gray (ATH-SR30BTBK) and natural gray (ATH-SR30BTGY).