The way they have done this is simply brilliant. The Apple Watch, thanks to the new WatchOS update, now listens for the sound of flowing water and soap, and once detected, it starts an automated timer for 20 seconds. This reminds users to wash their hands for the stipulated time. If the user stops before the countdown ends, the Apple watch reminds him/her to keep going. Once the task is successfully completed, the Watch plays a reassuring tune and a small animation.
The Handwashing feature is completely voluntary on the Apple watch, and this is how you can enable it.
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Open the Apple Watch app on your iPhone.
