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Pebble is just one of a growing number of smart watches, and Apple has even been rumored to be working on its own project. But Pebble's relatively large e-paper display and an API for app developers have generated considerable buzz for the project.
Pebble supports both iOS and Android devices via low-power Bluetooth 4.0, with iOS devices requiring a minimum of iOS 5 for basic compatibility and iOS 6 for the full set of features. When paired with an iOS 6 device, Pebble can display many of the alerts that typically pop up in Notification Center. Pebble is also working on building out a cloud infrastructure that would allow users to sign in to a web site or web app with their Pebble accounts and receive notifications from the site pushed to their watches.