Vi is an AI personal trainer that lives in biosensing earphones. She will track your activity, constantly learn and coach you to real results - all delivered through beautiful sound powered by Harman Kardon. With features like heart rate monitoring, GPS, cadence and speed tracking, you can feel confident about your workout. You will forget that she is an AI and immediately think of her as a true workout companion! She speaks beautifully and responds to your voice commands! Plus, Vi's aerospace-grade biosensors means you're getting more accurate measurements than many other wearable on the market today!