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2012 Sony Smartwatch
This is one of the most recent crop of watch-like devices, the Sony Smartwatch, which effectively functions as a second screen for your Android phone.
Sony recently released a software update featuring new watch faces and claims 200 apps for the watch, which allows you to read email, SMS and other notifications such as Twitter.
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