Yes, you can store up to 2GB of music (around 200 songs) on the Apple Watch. These tracks can be accessed without an iPhone through the Apple Watch Music app. This means you can listen to music on your Apple Watch without taking your iPhone with you, which makes it useful for jogging and other activities.
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The Apple Watch will ship with 8GB of storage but Apple will limit how many songs and photos users can store on the wearable device, according to 9to5Mac. Users will only be able to keep 2GB of music and up to 75MB of photos on the watch.
All songs and images uploaded to the Music and Photos apps on the Apple Watch will be accessible without an iPhone. This means users will be able to leave their iPhone at home and listen to music or view images on the go. Only 2 gigabytes of music (around "200 decent quality music tracks," according to 9to5Mac) is lot less than you will get from most iPod models, but you will be able to access your entire music library when your iPhone is nearby.
According to Apple, the Apple Watch will keep time "within 50 milliseconds of the definitive global time standard... with the same precision of GPS satellites." It does so by continually checking against time servers via the iPhone. Apple has not revealed specifics, such as the hardware involved or how often the watch syncs.
You do not need to sync / backup your Apple Watch manually. The Apple Watch automatically backs up its content every time you pair it with an iPhone. The content is stored in your iPhone iCloud or iTunes backups, but it can't be viewed from iCloud. A backup is also performed when you unpair the two devices. You can restore your Apple Watch from the last backup by choosing the Restore from Backup option when re-pairing your Apple Watch to your iPhone.
Yes, Apple Watch features a built-in speaker. The speaker and built-in microphone are used for voice calling and Siri interaction. Notifications are also delivered via the Taptic Engine, which gently taps the wrist to alert the wearer.
