Led lights
How do I switch off the 2 led lights at the back of my watch
Apple Watch Series 3, watchOS 7
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After a workout ends, they stay on for a few minutes to show how your heart rate slows down.
Also (if you wish), during running and walking workouts, turn on Power Saving Mode to disable the heart rate sensor. To do this, open the Apple Watch app on iPhone, go to My Watch > Workout, and turn on Power Saving Mode. Note that when the heart rate sensor is off, calorie burn calculations may not be as accurate.
