I bought a Pi 4 from Marketplace and used a regular USB cable like a Samsung phone as power source. I found I needed something higher rated because after doing some research I found that the little "flashing lightning bolt" in the upper right corner of my display means the Pi 4 is not getting enough power and could damage the device. -Time and data loss/corruption. So I bought it and haven't received a reminder since. And it's nice to have a power button to make sure the Pi is really on/off.
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