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The Pebble watch is probably the best known of the current crop of smartwatches. It began life as a Kickstarter project aiming to raise $100,000. It raised $10.3m instead.
The watch is compatible with iPhones and Android devices running OS 2.3 and up, but not Blackberry or Windows Phone 7. Alerts include incoming call, SMS, iMessage, calendar, Facebook messages and Twitter.