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- The wrist is a convenient area for collecting data about your physical activity, a task Apple Watch is designed to perform throughout the day. On the back of the case, a ceramic cover with sapphire lenses1 protects a specially designed sensor that uses infrared and visible-light LEDs and photodiodes to detect your heart rate. Apple Watch uses this sensor, along with an accelerometer and the GPS and Wi‑Fi in your iPhone, to measure all kinds of physical movement, from simply standing up to actively working out. This allows Apple Watch to provide a comprehensive picture of your daily activity...
A whole new level of tracking fun for NSA/GCHQ & co.