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TikTok and LunaTik watchbands for iPod Nano (2010)
After the 2010-era iPod Nano was introduced, it seemed natural to create a wristband encasement for it to turn the device into a full-blown smartwatch/wrist-mounted media player.
Design firm MNML created the LunaTik and TikTok bands, and through distribution partnerships managed to sell over 350,000 of these.
While the 2010-era Nano is no longer produced, bands from other companies have been created for the current version, although the solutions are not as elegant given that the current generation Nano is rectangular and larger.
Apple Patent 20130044215 for "Wearable Accessory Device" (2011)
In 2011, Apple filed a patent for a "Wearable Accessory Device", #20130044215.
While there is no proof any of this will be integrated in Apple products anytime soon, it's definitely an eye opener into future wearable computing developments at the company.
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.