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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Honestly, I have no idea. I bought this one, and it seems to work (but I haven't done any distance tests): http://www.ebay.co.uk/itm/291844009518
You can get them a bit cheaper though.