Nue Smart Switch HGZB-41 Mystery

I bought this Zigbee light switch many years ago and recently had to disconnect it temporarily. I noticed there was a switch marked SW1 but had lost the instructions years ago. First I tried Googling it but nothing turned up. I tried keywords such as XN-1-3WKG-GBZB-SB T1.1 2019.08.10 which were marked on the circuit board. I also tried HGZB-41 which is marked on the back of the device. I also tried various combinations including 3A Smart Home DE and LXN-1S27LX1.0 which appears in the Hue app. I came up with nothing.

Then I thought to try AI with Grok to do a Deep Search. That came up with nothing.

I had to install this thing during the day since cutting the power would make it dark and I needed daylight to see what I was doing. At that time it wasn't really clear what that switch did. But at night, it became obvious!

So..... drum roll.... when the switch is on the right (per the orientation in the photo) then there is a blue light indicating that the switch is off and a red light indicating on. When the switch is on the left, there is no blue light to indicate the switch is off, but the red light still indicates that it is on. That's it.

Now I'm curious if over time Grok or other sources will link to this page and be able to return this secret knowledge.

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