Check: Heart Rate (Pulse), Heart Rate Variability (HRV), Fitness, Stress level, Cardio calculations track progress and more using smartphone camera, ECG or BLE (additional device required). App detects heartbeats using: 1. Integrated camera (PPG-Photoplethysmography signal processing) 2. BLE enabled fitness additional device 3. Mobile ECG sensing extender additional device which is available for preorders PPG-Photoplethysmography signal is captured using smartphone camera by placing finger o