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

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.

Product quit working after only a couple of days. It is now only outputting 5V and the little block gets quite warm to the touch.

Works great

Works well with powerbank and compatible with the Masterbuilt Gravity 800. Connection won't twist lock in like Masterbuilt supplied cable but will be enough to make connection (bit of electrical tape to be sure). Easy to use, and had six hour smokes no issues, and can move smoker around to suit weather conditions.

I bought this adapter hoping to use a power bank to power my ADSL modem in case there was a breakdown in the commercial power supply. The result is that the modem turns on and works fine for 7-10 minutes and then begins to reset. I assume that this adapter does not do voltage regulation, or the power bank does not provide a stable voltage. I think I'm going to buy one of the mini-UPS that give DC output instead.

I got this to get rid of the wall wart power supply that came with my Shure GLXD16+ wireless system. Works great delivering power using a USB out on my power strip, cleans up my board. I recommend you verify the AMPs/Volts out on your USB device to ensure it matches this. Works for me!

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.

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.