The Dash is the worlds first wireless in ear headphone. You can either store up to 1000 songs on the headphones themselves or you can connect to a smartphone via Bluetooth. The music is just the tip of the iceberg with the dash though, it is a full fitness tracker as well. Tracking your performance as well as your vitals and not to mention a bone mic that allows you to talk wireless as well. Basically with these you can go out for a jog and track all your performance and vitals and while doing so listen to your favorite music and take a phone call or two in between all without wires going all over the place or a bulky headset. Sounds good to me.