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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
Wow, great news! Thanks for trying it out so quickly...
As mentioned in some other places these are branded LightwaveRF, JSJS Designs and Siemens.
Looks like white Siemens dimmer switches (and other stuff) are sold by screwfix:
£15 for the 2 gang dimmer switch seems amazing (about the same price as a normal dimmer), but looks like they're out of stock everywhere so I wonder if they've stopped stocking it :(
edit: It does surprise me that in this age of encryption, this is just asking for abuse. It'd be dead easy to write a receiver that pulled out the device IDs, then you could record them all over the course of a few days and could then keep turning every socket and light in every lightwaverf-equipped house within radio range off.