So frustrating! Some decent circuitry, but silly penny pinching and corner cutting has turned what could have been a premium product into a liability.
Let's start with the case. It's clipped together so solidly with a reinforcement lip that I had to break it to open it. It's solid.
Then comes the circuitry, and they started by omitting all the noise filtering, then used a fairly solid control chip with a chunky little transformer. But then they ruined everything by skimping on the class Y safety capacitor and the way the windings were put on the transformer. If they had kept the secondary windings away from the edge this could have been a safe transformer. But by running the secondary winding hard up against the primary winding they have created a possible insulation breakdown risk.
In use this plug would probably work. But if the insulation broke down then there is a risk that the devices plugged into it would keep working, but become referenced to the mains supply. In some instances that could result in a shock or equipment damage.
I didn't test the stated voltage and current due to the lack of something suitable to act as a 48V load.
I'll provide a link to this item, but it is purely for use as a reference in safety education. I don't recommend it for actual use:-
https://www.aliexpress.com/item/1005006479735381.html
It's a non-affiliate link. I don't want to earn gadget-credit from a dangerous product like this.
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https://www.youtube.com/watch?v=qWDD1CJl1f8