Apple has released the second developer betas for iOS 10, tvOS 10, and watchOS 3. The second round of betas is intended to allow developers to continue working on the new features and APIs first debuted at Apple’s Worldwide Developers Conference last month, with the unveiling of each of the major new operating system releases; the second round of betas likely continues to refine the experience from the first round of betas, with the release notes indicating several items fixed in each beta, as well as the introduction of promised features such as auto unlock for watchOS 3 and macOS Sierra users, the Emergency SOS feature for the Apple Watch, an updated design for Apple Music in tvOS 10, and improvements to Apple Music in iOS 10. The updates are available to registered developers from Apple’s Developer Site; those developers who installed the necessary beta configuration profiles for the prior beta cycle should also automatically see the new betas appear as an over-the-air update.