Jabra, the big name in headphones and headsets, is releasing a pair of wireless earbuds that continuously measure the user’s heart rate. Designed for athletes, the Jabra Elite Sport are essentially an advanced activity tracker, earbuds, and a Bluetooth communication device all in one. The heart rate tracking technology is called PerformTek and was developed by Valencell. It uses an optical emitter and detector to notice tiny changes in the reflected light as blood moves through the capillaries of the ear. Read More