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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
You're probably not releasing the button immediately after all the LEDs flash? It runs a self-test which requires you to lift the button, so if you keep it held it thinks the button is broken and flashes red.
Can you check if your Mac actually has Bluetooth low energy? instructions here: http://www.imore.com/how-tell-if-your-mac-has-bluetooth-40