BackBeat FIT 6100 is designed for athletes who live for the heart-pounding, sweat-drenched sensation after a grueling workout. Built with a lightweight, ultra-comfortable design, An adjustable Sport-Fit headband, and up to 24 hours of power on a single charge, These wireless headphones will keep up in and outside the gym.Rugged and DurableMAXIMUM STABILITY WORKOUT HEADPHONES: Unique Sport-fit headband can be adjusted for an ultra-stable fit during rigorous training while the unique hexagonal pattern provides extra gripRICH, POWERFUL SOUND: 40 mm angled drivers and a noise isolating, over-the-ear headphone design creates an acoustic chamber for deep, rich soundSWEATPROOF AND WATER-RESISTANT: Sweatproof and IPX5-rated water-resistant Bluetooth headphones can withstand moisture and spills -- complete with a breathable perforated headband and wipe-clean ear cushionsMOVE MORE, CHARGE LESS: BackBeat FIT 6100 wireless headphones have up to 24 hours of power on a single charge. When you're in a pinch, a 15-minute quick charge provides up to one hour of power; or listen in corded mode with the micro USB to 3.5 mm audio cable includedSOUND MIX: Create the perfect blend of your surroundings and music with Awareness mode and Sound Mix. So, chat with your gym partner between sets and stay connected to the outside world when you're running outdoors with BackBeat Fit 6100 wireless sport headphonesAutomatically connect up to two devices simultaneously, listen from either, and pair up to eight