Arc's water-resistant shell and an interior nano-coating offer outstanding defense against liquids such as water, rain, and sweat. let your music motivate you from the moment you start working out. arc's 10 mm composite drivers power well-balanced sound with soaring highs, lush mids, and deep bass. all-day comfort the adjustable metal ear hooks hug the shape of your ears, while the silicon covering provides grip to ensure arc stays in place-even during hardcore workouts. drawing from soundcore's anker heritage, arc is engineered with a premium li-ion battery and exclusive power management technology. this ultra-efficient combination offers 10 hours of non-stop music to keep your workouts covered for the whole week. hands-free calls soundcore arc is equipped with a built-in mic and remote control to conveniently receive and make calls. to ensure the microphone picks up your voice clearly, cvc noise reduction technology blocks out distracting ambient noises.