"The Arc II Sport earbuds are our new activity-focused open-ear earbuds. We’ve upgraded the open-earbud experience that we helped pioneer and introduced improvements throughout. Arc II Sport earbuds feature greater flexibility for improved comfort, 6-axis motion sensor for hands free control, IPX5 water and sweat resistance, and improved battery life with an enhanced charging case. Arc II Open-Ear Sport earbuds also features Multipoint Connectivity allowing you to seamlessly switch between multiple devices, so that you can listen to music from one device and quickly answer a call from your phone."