The bizarre flashing lights on a smartwatch

Get your first month of KiwiCo free: Smart watches use a flashing green light to measure your heart rate and an rad and inferred light to measure your oxygen saturation. The way it works is really clever. Check out Andrew Steele s video here: Check out my Motion Amplification video here: You can buy my books here: You can support me on Patreon and get access to the exclusive Discord: just like these amazing people: Brendan Williams Edward Unthank Frank Hereford Jeremy Buchanan Tj Steyn Jeremy Cole Matthew Cocke Pavel Dubov Alan Wilderland Alnitak DamTheGreat David Whitesell Grant Hay Heather Liu John Doe John Zelinka Lukas Biewald Marshall Fitzpatrick Matt Nathan Blubaugh Paul Warelis Tim S Root Alnitak D