This info from the Apple site:
It's called the Taptic Engine, a linear actuator inside Apple Watch that produces haptic feedback. In less technical terms, it taps you on the wrist. Whenever you receive an alert or notification, or perform a function like turning the Digital Crown or pressing down on the display, you feel a tactile sensation that's recognizably different for each kind of interaction. Combined with subtle audio cues from the specially engineered speaker driver, the Taptic Engine creates a discreet, sophisticated, and nuanced experience by engaging more of your senses. It also enables some entirely new, intimate ways for you to communicate with other Apple Watch wearers. You can get someone's attention with a gentle tap. Or even send something as personal as your heartbeat.
Pat
Sent from my iPad...
> On Feb 17, 2015, at 8:34 PM, Pabitra Saha pksaha000@yahoo.co.uk [iPad] <iPad@yahoogroups.com> wrote:
>
> Then what are the four sensors behind the watch expected to do
Posted by: Pat Taylor <pat412@mac.com>
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