What power supply should I use for my Arduino?

Hey there,

So, I picked up an Arduino through a local marketplace deal, but it didn't come with a power supply—specifically, I'm missing the actual power cable.
I honestly went into this thinking any old micro-USB cable I had lying around would do the trick, but man, was I wrong. Some of them won't even register at all, and the one I am currently using keeps triggering that annoying little yellow warning icon in the corner of my Netflix screen, which I assume is the system's way of telling me the voltage is dropping or the current is just too weak to keep things running smoothly.

EDIT:
Would this particular one work for an Arduino?:

And what about this option here?:

Yeah, that pretty much confirms it—your power supply just isn't cutting it.
The official brick rated at 5.1V @ 2.5A is basically the absolute floor here; you really shouldn't be dipping below that if you want any stability.
If you aren't planning on hooking up a bunch of external hard drives, then honestly, that other option would probably suffice for your needs.

If you aren't in a massive rush to grab something new, you might want to check out something like this instead.
https://www.banggood.com/Geekworm-EU...r_warehouse=CN

Wait, so this one is rated at 5V rather than 5.1V? I can't help but wonder if that little difference actually matters in practice. Honestly, I always get this nagging sense of anxiety when I'm ordering tech from those overseas manufacturers on sites like AliExpress—you start questioning whether the power ratings they print on the box are even remotely accurate or if it's all just wishful thinking. But then again, looking through the user reviews, everything seems to be pointing toward it being perfectly fine, which helps settle my nerves a bit! Do you happen to have this exact same setup yourself?

I’ve personally tested both the original version and this one from Adafruit.
Neither of them had any issues with power delivery—it’s plenty strong—but honestly, the big win with the Adafruit model is having an actual power switch right there.