Simply wear Spark to stay awake. As you move, Spark keeps track of your movements and calculates your average motion.
Using motion sensors and an internal algorithm, Spark detects if you have fallen asleep when your average motion decreases significantly.
The tech that senses your movement.
The science that calculates your motion frequency.
The part that keeps you awake.
The screen that displays the time and mode.
The band that keeps the watch on your wrist.