Does LifeWatchs perform biometric records constantly?

Yes, Watch Lite can constantly monitor your Biometrics around- the-clock, 24 hours a day. With the real-time transmission of recordings and advanced algorithms meant to analyze your heart rate signal and store data on a regular basis, you can rest comfortably, knowing that all your vitals are being kept in check and safely stored.

What is the function of the sensors with the green light and the red light?