I recently purchased this button with the shelly 1 relay.
There was no manual in the box and no information inside the button on how to connect lamp and power.
I connected the device, when I connected it to power nothing worked.
I then checked on the internet to find a manual. After a while I found instructions and say that I had connected lamp and power the wrong way round. I reconnected the device but still no luck.
I did notice two issues: the button is not very well made. It comes loose very quickly when you press on one side.
The second problem is very dangerous. There were sounds of arcing. You could hear the white substance letting power jump from one terminal to another. VERY DANGEROUS.
Please stop selling this product!
I also tried to connect the shelly 1 relay without the button and found it does not work any more, the web pages load but the relay does not work.