The Dash plays music from a 4GB music player or through a Bluetooth connection to a smartphone. The smart in ear headphones tracks movements (e.g. pace, steps, cadence, distance) and measures heart rate, oxygen saturation and energy spent. As a Bluetooth headset it delivers sound through an ear bone microphone. It provides noise isolation, but the wearer can choose to channel ambient sound with the transparent audio feature. Safety and peace of mind come from awareness of your surroundings.