Taptic Engine is a linear actuator inside Apple Watch. This piece of hardware taps the user on the wrist to deliver tactile feedback when interfacing the Digital Crown or Force Touch. It will also deliver a tap to help notify the user of alerts and notifications.
Yes, Apple Watch includes a specially designed sensor that uses photodiodes, LEDs, and infrared LEDs to detect the user's heart rate.
The heart rate sensor is contained on the back of the Apple Watch case, within a ceramic cover with sapphire lenses. The custom heart rate sensor can provide data to a variety of health and fitness apps, and helps monitor daily activity.
Apple Watch includes a variety of health and fitness app functions. The device tracks daily activity using a built-in custom heart rate sensor along with an accelerometer.
GPS and Wi-Fi in the iPhone paired to Apple Watch also contribute data, which measures all kinds of physical movement. Apple Watch seeks to provide a comprehensive portrait of daily activity for the user, and assist with fitness goals.
To wake the Apple Watch display, simply lift your wrist. Sensors in the Apple Watch will automatically turn on the Retina display.
Reports have indicated Apple Watch can also run in a low energy Power Reserve mode. This mode would only display the time, reducing power consumption and extending battery life.
The Apple Watch charger combines MagSafe technology with inductive charging. There are no exposed metal contacts, and the charging cable can be connected without precise alignment.
Simply bring the cylindrical charging connector close to the back of Apple Watch, and magnets will do the rest. The connector will snap into place, and Apple Watch will begin charging.
