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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.
2013 Martian Passport
The rather brilliantly-named Martian Watches offers the Passport watch which features voice controls so that it can function as a speakerphone your smartphone or allow you to access services such as Siri.
Image: Martian Watches
The arrival of Google's Android Wear, which aims to make smartwatches operate better with Android smartphones, has reinvigorated the smartwatch market, with a number of consumer electronics manufacturers having another go.
Because smartwatches have tiny screens and batteries, Android Wear rethinks the Android user interface and stripped it back to conserve power — and stop smartwatches driving users crazy with constant updates. It builds on the notification system used by Android apps, giving devices a 'context stream' made up of a vertically-scrolling list of 'cards' carrying small pieces of information.
Above is Motorola's Moto 360 device.
Image: Sarah Tew/CNET