Fuel Your Beats: Leading hardware and software combine to develop 100% more bass and drive workouts to the extreme. A Kasturba acoustic tube positioned behind the 12mm dynamic driver which is surrounded by an ultra-elastic material capable of stronger vibrations to develop thundering low-end. Workout and Cool Down: Dual EQ allows you to turn on Bass Up to intensify the low-end and drive your workout, then deactivate it to dial down the audio power as you start your warm down and bring your heart rate back to normal. Extreme Sweat proof: IP68 defense against dust, water, and submersion with Sweat Guard technology to resist the corrosive nature of sweat. Lasts 100x longer than ordinary earphones in sweaty conditions with a submarine structure and hydrophobic Nano coating. Incredible endurance: get 9 hours of intense listening from a single charge and boost that to 36 with the included charging case. That?s up to 5 weeks of workouts on a single charge. In a rush? Charge for 5 minutes to listen for up to 1.5 hours. Effortless comfort: extra-flex ear tips and hooks ensure a satisfying And invincible fit, no matter how hardcore your workout. Comes with an extensive selection of tips and hooks for tailored listening. Clear calls: CVC 8.0 noise reduction effectively isolates your voice while removing background noise for a flawless call experience. Apt delivers exceptional, lossless sound quality over your Bluetooth Connection.