A quote from Valencell best summarizes what this is about: “Valencell’s Healthset® solution integrates a fitness sensor directly into music earbuds and headsets to create a single device that serves multiple functions. While consumers exercise, they will simultaneously enjoy their music and gather real time heart rate, calories burned, distance, speed, and aerobic capacity (VO₂max). This information is displayed on their mobile phones, mp3 players and online communities to provide valuable insight into their fitness progress as performance goals are achieved.”   MORE