FOCI 2 is a wearable tracker which includes an app providing information about the wearer’s emotional state by analysing diaphragmatic breathing. The purpose of this technology is to find out when the user is stressed or distracted, and to counteract this by means of biofeedback training. The tiny tracker with accelerometer is worn on the hip. Thanks to machine learning, it quickly distinguishes the physiological characteristics of breathing and displays emotional states in real time.