Apple has revealed the second version of its operating system for the Apple Watch, introducing new features that unlock more functionality for developers.
WatchOS 2 was revealed at Apple's World Wide Developer Conference (WWDC) and is available as a software development kit (SDK). It has been slated for general release in October.
The SDK gives developers access to application programming interfaces (APIs) that enable them to create apps that work more closely with the hardware and software features native to the Apple Watch.
Developers of third-party apps can integrate features such as the Watch's Digital Crown or Taptic Engine with their software.
For example, temperature and lighting control apps can work with the Digital Crown to allow more accurate control of settings, while Volkswagen car owners can get haptic feedback when their cars are locked through the car maker's app.
Alongside these APIs, WatchOS 2 introduces Wi-Fi support, which enables the smartwatch to work independently, rather than relying on being connected to an iPhone.
Apple also revealed an Activation Lock feature in the Watch OS update in a bid to address concerns that the Apple Watch is a tempting target for thieves. The lock allows users to secure an Apple Watch with their Apple ID to prevent someone else wiping or activating the device if it is lost or stolen.
Apple chief executive Tim Cook said the new operating system will allow developers to unlock more from the smartwatch.
"Today we're bringing native apps to the Watch. We believe in technology for the wrist and we believe that you will create powerful new apps to change our lives."
Other features include the ability for apps to support video playback on the Watch's display, rewards offered through Apple Pay, and Nightstand Mode, which allows the Apple Watch to be used as a bedside alarm clock when it has been taken off a wearer's wrist.
Time Travel adds the ability to scroll through past, current and future events, such as upcoming flights and meetings, using the Digital Crown. Data can be extracted from third-party apps to add to Time Travel's information.
Keeping with the theme of traversing time, WatchOS 2 introduces the Time-Lapse watch face, which offers a selection of time-lapse videos shot over a 24-hour period in locations such as New York and London to display on the smartwatch.
Apple also revealed iOS 9 at the conference, which offers a range of improved features for the iPhone operating system.
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