There are different versions with different specs and different internals.
Mine is a version with 3~12V output voltage, 2.5A rated output current plus an additional 1A USB socket. The problem with it is that the secondary regulator is a TL431 (≥2.5V) in series with an optocoupler (1.2V) so it simply can't regulate less than about 3.7V

Its output voltages also are slightly higher than nominal, presumably to compensate cable loss at high currents

Oh, and there is another problem: no OCP. The secondary rectifier can overheat and desolder itself when pulling >3A of current at 3V. The whole thing is kinda crap, but okayish if you are careful with it and understand the limitations.