# The Secret Science Of Your Smartwatch Glow

URL: https://technosports.co.in/the-secret-science-of-your-smartwatch-glow/  
Published: 2026-09-08  
Updated: 2026-09-08  
Author: Reetam Bodhak

Ever wonder why your smartwatch pulses with green light? It’s not a glitch—it’s advanced photoplethysmography! By shining green light onto your skin, sensors track blood flow rhythm with surgical precision. Because blood absorbs green light, your device calculates your heartbeat in real-time. Need more data? Red and infrared sensors step in for SpO2 tracking. It’s safe, efficient, and pure biometric genius.