Like holding a pebble in hands, “Metalligence D2R2 Heart Rate Variability Sensor (HRV)’s” smooth-and-harmonic touch makes you were surrounded by natural atmosphere. Unlike traditional health care products’ aging and uncomfortable feel, HRV’s gentle colorful and portable design links up safe and comfort feeling. Only needs few components, HRV integrates surveillance and Bluetooth technologies in one device. Additionally, its intelligent App UI with actual backend Cloud medical service team that support HRV reveals as a smarter and friendly health monitoring interface.