Meet the Zenso: a smart wearable technology that uses HRV and CBT to reduce your stress. It comes with a biofeedback strap for ECG, heart rate, and HRV logging. You get audio exercises on your phone to reduce anxiety. The Zenso uses bioRhythm haptic feedback to help you control your heart rate consciously.
The above video provides you with more information on Zenso. More information is available here.