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SONY MN2SW Android Watch (2012)
Released early summer of last year, SONY has the first "Watch companion" released into the wild with its MN2SW, which requires an Android phone with a Bluetooth connection.
For a review, check out CNET's in-depth look at the device.
Pebble, a new startup company, will soon be offering its low-power, E Ink-based bluetooth watch companion for iOS and Android smartphones in April-May of this year. The device will cost $150. The device contains a motion sensor and can run simple apps that display telemetric-types of output from data coming from connected Smartphones.
Samsung Altius (2013)
Based on leaked screenshots Samsung appears to be working on a smart watch known as the "Altius". Very little about this device is known and what operating system it runs on.