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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
I'm pretty sure there is a tab in there between the battery and PCB, but it's clear plastic and cut down to the length of the PCB, so it's really easy to miss.
Best way to tell if it's working is to take the battery out, then put it back in with the button held down. The green led should light up, and if you keep the button pressed for around 3 secs all 3 leds will light. If you then release it, the green led should flash and few times, indicating the self test has passed.