With the portable charging case, these headphones will never let you down. You get up to three hours of playback or talk time on a single charge. When you're on the go with a fully charged case, you have an additional nine hours with multiple charges. Simply place the headphones back in the charging case each time they need to be recharged. A full charge takes 1.5 hours. Thanks to the snug, lightweight design, you can enjoy your music with true comfort. The soft, rubberized wingtips conform to the outer ear. With interchangeable rubber ear tips, you can find the perfect fit in your ear for a secure seal, ensuring you don't miss a beat. The 6mm neodymium acoustic drivers deliver great sound and powerful bass. The oval acoustic channel maximizes passive noise isolation. In mono mode, you have the option to leave one ear free if you want to remain aware of your surroundings.