How Apple Watch measures your heart rate?

Got a question about the heart rate sensor on Apple Watch? Find out how it works!

The heart rate sensor in Apple Watch uses what is known as photoplethysmography. This technology, while difficult to pronounce, is based on a very simple fact: Blood is red because it reflects red light and absorbs green light. Apple Watch uses green LED lights paired with light‑sensitive photodiodes to detect the amount of blood flowing through your wrist at any given moment. When your heart beats, the blood flow in your wrist — and the green light absorption — is greater. Between beats, it’s less. By flashing its LED lights hundreds of times per second, Apple Watch can calculate the number of times the heart beats each minute — your heart rate. In addition, the heart rate sensor is designed to compensate for low signal levels by increasing both LED brightness and sampling rate.

You can check your heart rate any time using the Heart Rate Glance. And when you're using the Workout app, Apple Watch measures your heart rate continuously during the workout. This information, as well as other data it collects, helps Apple Watch estimate how many calories you’ve burned. In addition, Apple Watch measures your heart rate throughout the day when you’re still. You can see these background heart rate measurements in the Health app on your iPhone. Since Apple Watch only takes this background reading when you're still, the time between these measurements will vary.

Find out how it works here: http://apple.co/25pydKZ

Personalize your Apple Watch with awesome watch faces

Personalize your Apple Watch with awesome watch faces and bands available at http://bit.ly/1WdQysp. Get the Apple Watch today at any of Sharaf DG stores, their mobile app or through their website.

The case is crafted from a refined 316L stainless steel that’s been cold forged, making it up to 80 percent harder. It’s less susceptible to nicks and corrosion and has a beautiful mirror finish.

Sapphire crystal display.
The display is protected by ultra-hard, polished, precision-machined sapphire crystal.

Apple Watch Available at Virgin Megastore on October 22

Available on October 22 at Virgin Megastores in Mall of the Emirates, Deira City Centre, Dubai Mall, Mercato Mall, Mirdif City Centre, Abu Dhabi Mall & Al Wahda Mall.

Receive and respond to notifications in an instant. Track your daily activity. Control your music using only your voice. With Apple Watch, important information and essential features are always just a raise of the wrist away.

Not to mention Music, Maps, and phone calls. Apple Watch lets you do the things you do every day, more easily and conveniently. As well as lots of things that simply weren’t possible before.

More faces and features for an even more personal experience.

To take advantage of its size and location on your wrist, Apple Watch was designed with its own unique operating system — watchOS. With watchOS 2, we’ve refined it. There are more faces to choose from. Faster, more powerful apps.. Enhanced communication options. And innovative new ways to make your Apple Watch your own.

How to Use third-party apps on your Apple Watch

Find, install, and manage third-party apps for your Apple Watch.

Find third-party apps in the App Store

From your iPhone, you can find third-party apps designed to work with your Apple Watch:

1. Open the Apple Watch app on your iPhone.


2. To browse apps, tap Featured or Search. Tap an app to download.
   


3. Enter your Apple ID password.

Learn more about the App Store and get help if an app isn’t installing to your Apple Watch successfully.

Manage your third-party apps

You might already have third-party apps on your Apple Watch. When you set up your Apple Watch, you have the option to either Install All or Install Later. If you pick Install All, any third-party apps on your iPhone that are compatible with Apple Watch will automatically sync. And any future updates to third-party apps on your iPhone, or any future app purchases, will automatically sync to your Apple Watch.

If you don't want all of your future iPhone app purchases to sync automatically to your Apple Watch:

1. Open the Apple Watch app on your iPhone.


2. Tap My Watch > General > Automatic Downloads.


3. Turn off Automatically Download Apps.

If you pick Install Later when you set up your Apple Watch, the apps on your iPhone that are compatible with Apple Watch won't sync automatically. To manually sync third-party apps on your iPhone that are compatible with your Apple Watch:

1. Open the Apple Watch app on your iPhone.


2. Scroll to find the app you want to sync, and then tap it.


3. Turn on Show App on Apple Watch.

If you want to uninstall an app on your Apple Watch:

1. Open the Apple Watch app on your iPhone and tap My Watch.


2. Scroll to find the app you want to remove, and then tap it.


3. Turn off Show App on Apple Watch.

Manage Glances for third-party apps on your Apple Watch

You can use up to 20 Glances on your Apple Watch. By default, Apple Watch uses 9 Glances, though you can edit these at any time.

Edit your current list of Glances

Open the Apple Watch app on your iPhone and tap My Watch > Glances.

• Remove a Glance by tapping . Then tap Remove.


• Add a Glance by tapping .


• Rearrange the order by pressing and holding . Then drag and drop the Glance. 

Show or hide a Glance for a particular app

1. Open the Apple Watch app on your iPhone and tap My Watch.


2. Scroll to find an app.


3. Tap it to see its settings.


4. Make sure Show App on Apple Watch is turned on.


5. Turn on Show in Glances. Not all apps offer a Glance setting.
   

Manage notifications for your third-party apps

Your third-party apps will use the same notification settings as your iPhone. If you don’t want your Apple Watch to mirror the notification settings on your iPhone:

1. Open the Apple Watch App on your iPhone and tap My Watch.


2. Tap Notifications, then scroll down.


3. Turn off Mirror iPhone Alerts.

How to Listen to Music on your Apple Watch

When your paired iPhone is in range, you can use your Apple Watch to listen to any music stored on your iPhone. To enjoy music on your Apple Watch without your iPhone, you'll need to pair with Bluetooth headphones and follow the steps in this article.

Make a music playlist

You can keep one music playlist on your Apple Watch at a time. Audiobooks and podcasts aren't compatible.

1. On your iPhone, go to the Music app.
2. Tap My Music > Playlists > New.
3. Give your playlist a name, and then tap Add Songs.
4. Search or tap to find songs, artists, or albums to add. 
5. When you find something that you'd like to add, tap  .
6. After you add the item, tap Done. You can then search for more music to add. 
7. When you're done adding music, tap Done to save your playlist.

If you want to edit an existing playlist:

1. Open the Music app on your iPhone and tap My Music > Playlists.
2. Tap a playlist, then tap edit.
3. To add songs, tap  and search or tap to find songs, artists, or albums. Tap  to add them to the playlist. To delete songs, tap  > Remove.
4. After you add or remove an item, tap Done. You can then add or remove more music.
5. When you’re done editing the playlist, tap Done to save your changes.

Sync your playlist

1. Set your Apple Watch on its charger and make sure the device is charging.
2. On your iPhone, go to Settings > Bluetooth. Make sure Bluetooth is turned on.
3. From the Apple Watch app on your iPhone, tap My Watch > Music > Synced Playlist.
4. Tap the playlist you want to sync to your Apple Watch. When a message next to your playlist says Sync Pending, your playlist will begin syncing from your iPhone to your Apple Watch.
5. Wait until the sync is finished before using your Apple Watch. To see the sync progress, open the Apple Watch app on your iPhone and tap Music.

You might need to download any music stored in the cloud, such as music from Apple Music or iTunes Match, to your iPhone before you can sync it with the Watch.

     

Listen to the playlist on your Apple Watch

Your playlist won't be available on your Apple Watch until you've paired your watch with Bluetooth headphones. After pairing, you can listen to your synced playlist:

1. From the Home screen on your Apple Watch, tap the music app. 
2. Force Press, then tap Source > Apple Watch.
3. Tap play to listen to your playlist.

Remove a playlist from Apple Watch

1. Open the Apple Watch app on your iPhone.
2. Tap My Watch > Music > Synced Playlist > None.
3. To remove the playlist, set your Apple Watch on its charger and make sure it's charging.

Learn More

Your Apple Watch playlist is limited to 1 GB by default. In the Apple Watch app on your iPhone, you can change this setting to 2 GB, 500 MB, or 100 MB. If you prefer to limit by song number, you can limit your playlist to 15, 50, 125, or 250 songs.

Apple Watch How to Use Digital Touch

With Digital Touch, you can send sketches, taps, or even your heartbeat to your friend's Apple Watch.

Get Started

You can send a Digital Touch from your Apple Watch to your friend's Apple Watch. You and your friend can follow these steps to get started:

1. Make sure that your Apple Watch is paired to your iPhone. Digital Touch uses the phone number associated with your iPhone and the Apple ID you signed in with when you set up your Apple Watch.


2. Add your contacts to Friends on your Apple Watch. When you pair your Apple Watch and iPhone, up to 12 of your favorite contacts will automatically appear in Friends on your Apple Watch. You can also manage your friends from the Apple Watch app on your iPhone. 


3. Send your friend a sketch, tap, or heartbeat. If you can send your friend a Digital Touch, you'll see  after you select your friend.

       

Send a Digital Touch

Press the side button to see your friends, select someone using the Digital Crown, then tap their initials or picture. You'll only see  if your friend has an Apple Watch. 

If your friend recently paired their Apple Watch, you might need to wait an hour or more before you can send them a Digital Touch.