How to set output voltage on this dual output buck converter board?
I guess this boards dual output voltage is configured by the EN terminal?


I'd say that the ad is telling you that that the devices are available in four different dual-voltage options.

The EN pin is most likely to be an ENable pin which will turn the output on or off. It is most likely a digital input so you don't have the option of programming a particular output voltage.


  These are cheap on eBay but I bet they arrive undocumented ...


Our advice, as always is, "No datasheet? No sale!"