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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
Thanks - just updated the link.
Yes, it's a standard Bluetooth Low Energy 4.2 dongle - no fancy 5.0 features like long range (not that those are currently supported by Espruino devices anyway).
It's what I use on my desktop here (and for flashing Bangles) so I'm reasonably confident in it. There's a very noticeable improvement in range over the standard USB dongles (and the one usually built into laptops).