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.

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

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.

First off, I hate bright LEDs on power supplies and USB cables. The green led of this one isn't as bad some blue LEDs but it's still too bright. One star off for the bright LED. I'm using this to power a HDHomeRun Flex 4 tuner. It generally hovers around 12 volts and 0.8 amps. Tried a couple of 1 amp supplies and the tuner just didn't like them and I wouldn't get some of my local channels. Was looking for a higher amp USB power supply and couldn't find much out there. Guess 12v1amp is pushing the USB spec. Thankfully this one delivers 1.2 amps and HDHR tuner is fine with it. I'm using an Anker multiport USB power supply to power a RaspberryPi, USB antenna booster and the HDHR. The USB supply is designed for 3+ amps out each port at same time. So the DROK step up converter is doing fine. If your trying to power it with a cheap phone charger, your results may not be as good. My goal was to mount the antenna stuff, Pi and hard drive on small board and hand it on a wall in the garage. Not have it be an eye sore and still be compact. The DROK supply help to not have a wallwart blocking a power outlet.

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 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 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 power supply does not meet its spec. It is supposed to output 1.2 amps at 12 volts, but it does not come close to that. My best guess is it put out somewhere between 0.15 and 0.5 amps at 12 volts. The device I wanted to power uses about 0.6 amps at 12 volts. When I connected this power supply to that device, my device never turned on. In fact, this USB power supply kept cycling on and off at about a 1 second rate when it was trying to output 0.6 amps. I did connect this item to a device that uses about 0.15 amps, and it worked fine. However, that is way below the 1.2 amp spec. I did not give this 1 star, because it does work, but it works at a much lower level than was promised. It's of no use to me; I sent it back.