The ATH-SPORT60BT wireless in-ear headphones feature high-sensitivity 6 mm drivers with a powerful magnetic circuit and dedicated headphone amplifier to deliver strong, high-fidelity audio reproduction to fuel your workouts. Equipped with Bluetooth® wireless technology and in-line mic and controls, the headphones let you easily control your music and answer calls while you're on the go. Plus, with the multipoint pairing function you can connect to two Bluetooth devices at once! The ATH-SPORT60BT headphones come with the standard assortment (XS, S, M, L) of silicone eartips, plus four sizes (XS, S, M, L) of ear fins that secure the earbuds without wrapping around the ears. The adjustable cable rests comfortably behind the neck. Additional features include IPX5 waterproof certification, so you can wash the headphones off when you're done working out; voice confirmation of various functions, including power on/off, Bluetooth connection status, and low battery level; and AAC codec compatibility, for better wireless sound quality. The internal battery delivers up to six hours of continuous use and recharges easily with the included 30 cm (12") USB charging cable.