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2011 Wimm Watch
The WIMM watch running a modified version of Android was actually a styled as a developer kit device rather than a consumer device, with the aim of kickstarting an app ecosystem based around the device.
The Wimm was well-received but short-lived: during the summer of 2012, WIMM Labs entered into an "exclusive, confidential relationship" for its technology and ceased sales of the developer preview kit (Google later confirmed that it had snapped up the company).
Photo: James Kendrick/ZDNet
2012 Sony Smartwatch
This is one of Sony's watch-like devices from a couple of years back, the Sony Smartwatch, which effectively functions as a second screen for your Android phone, which allowed 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.