DROK USB to 12v Adapter - 5V to 12V Step Up Converter, Boost Converter Voltage Regulator with 5.5x2.5mm/3.5x1.35mm Ports and 1.2m Cable

Works great to power 12v android auto display on my motorcycle.

This is exactly what I wanted to go from lower voltage to what is required by router from a power bank. This is my emergency backup ran off my phones mobile data if internet outage or electrical outage. Good build quality. Price seems fair and it met my needs and functions well. I can tell you the smaller adaptor fit my asus router.

This does put out 12v but I have not found anything that will work on it, even the usb voltage tester shorts it out half the time and thats very little amperage, it cannot handle any sort of load at 12v so its useless to me. not sure what you could power with it, if it wont power a test meter even.

I bought this so that I could use my phone backup battery bank with my radio. It has a finnickey power-on sequence that needs experimentation. In short, I power on the battery bank at nearly the same moment I power on my HAM radio. Also, it does not provide enough power for transmit on the 2 highest power settings, but does work on the 2 lowest transmit power settings. I'll just use a bigger antenna if I anticipate needing it. Too bad nobody makes one that provides enough current for the higher power levels. Maybe one will come along in the future, I'll be on the lookout for it.

I found it hard to find a decent 5v USB to 12 converter. This one seems to work well so far. I have 3 of them, the open circuit output voltage ranges from 12.4 to 12.63 volts. Seems like a large range, but these are cheap devices, probably just a switching step up converter. I cannot say how much current I can draw out of them, but I started using one to power a device that draws about 3/4 amp, and in parallel with a LiON battery as backup this converter was able to run the device and slowly charge the battery. So I'm thinking it's capable of 1 amp or so. For now I'm using two of them in parallel (via Y cable), and yes this is probably not designed for by the manufacturer. As you would expect, open circuit you get the higher of the two converter voltages, then under 3/4 amp total load (in parallel) they dropped to 12.45 volts. Not bad in my application as the backup battery needs min of 12.3 volts to charge. They don't get very warm and have internal LED that is green with no load, and red with any load so you can see when some current is being drawn when the LED goes red. I did originally plan on putting a 47uF cap on the output of each one hoping to smooth out the output when in parallel in case somehow they interfered with each other, but that doesn't seem necessary so far especially with the backup battery serving the cap function. Hope this is useful info.