Back in 1998 the "Java Ring" from Sun Microsystems was designed for this purpose, and though it never became a mass-market product it got a fair amount of hype

Back in 1998 the "Java Ring" from Sun Microsystems was designed for this purpose, and though it never became a mass-market product it got a fair amount of hype when it was new: http://www.javaworld.com/article/2076641/learn-java/an-introduction-to-the-java-ring.html http://www.javaworld.com/article/2076641/learn-java/an-intro... http://www.nngroup.com/articles/javaring-wearable-computer/ http://www.nngroup.com/articles/javaring-wearable-computer/