[lucaspiller]

It should be noted that Sonoff devices are not UL Listed, unlike the device the article discusses. Given that and how Chinese product companies like to cut corners with these type of devices (see bigclivedotcom on YouTube), I’m not sure I’d trust connecting one of these to mains voltage.

[janekm]

From looking over their schematics and layout, they are fairly well designed, and they have gone through CE certification so fine for European consumers.

No UL certification could be an issue for US consumers though.

[IgorPartola]

I understand CE to basically be self certified. It’s good but mostly meaningless when compared to bring UL listed or higher, which require equipment tests as well as frequent drop in visits from UL people to your manufacturing fascilies.

[janekm]

They have undergone testing by a third-party test house for their CE certification. While you're right that in many cases CE can be self-certified, this is not (really) the case for mains equipment, the testing required by the European standards are such that it would be difficult to perform yourself.