iGreely DC 5V to DC 9V USB Voltage Step Up Converter Cable 3.3ft/1m Power Supply Adapter Cable with DC Jack 5.5 x 2.5mm or 5.5 x 2.1mm, for Fan, Led Light, Wireless Router, Speakers and More Devices

Works for powering up a 12v monitor from a USB port. Great idea!

So I tend to try to prepare for the worst case scenario and since I have some massive power banks. I figured if I could power my modem router in a power outage without using my generator this would be perfect. I purchased a asus router that I just keep around to connect to my phone mobile data to run my essentials during a power internet outage. Usb tethering making for a much more reliable service then just a Hotspot. Helping with streaming and keeping everyone from going crazy on me. If this is your way of thinking this will work for the said application.

Step up voltage for fencing scoring machine.These are verified to work with Favero FA-01 and FA-05 fencing scoring machines, when used with an XLR (D Pin) 3-pin female to 5.5x2.1mm female barrel adapter.Contact NJIFA for more info.

I purchased this thing to power a guitar pedal from the USB jack on my rechargeable PA speaker which I use as a Bass amp. The fist thing I did when it arrived was plug it in and test the output with my scope meter. It puts out a very flat 9v DC. The output tends to be 1/4v high or low, which I would say is within tolerance.The downside is that, even though the plug is the right size for guitar pedals, the polarity of the plug is backwards and the "adapter" that is included doesn't do anything - it doesn't change the size or the polarity. It would have made sense to include a polarity-reversing adapter, but no, I had to use polarity reversal plug that I happened to have on hand (the red adapter in the photo).Once I got the polarity figured out, I was pleasantly surprised at how well this thing powers my fuzz & octave pedals.There is a bit of RF noise, which I mostly solved by slipping a ferrite bead over the power cord and one over the guitar cord.

The polarity is tip positive, it did not work for me.I need tip negative to power boss Loopstation.:/

me sirvió demasiado en su momento y ahora lo tengo guardado, pero es muy útil, lo recomiendo.

It might be incorrect polarity or something else,but it just didn’t work

Good value for the money