Ray records the light you get through the day, around the clock. The same solar cell that powers Ray also tells it how bright your surroundings are.
How does Ray know I am outside?
Sunlight is far brighter than indoor lighting, even in the shade. Ray uses that difference to tell time outdoors from time spent indoors under bright lights.
What can I do with it?
Open the app to see how much light you got each day, alongside your sleep, heart rate, HRV, temperature trends and steps.
See everything Ray tracks and how Ray's solar charging works.