Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Do I use this to install a powered usb hub in a car?
Document: Was amazed that, for the price, how stable this unit was. Using it to regulate 6 volt positive ground car power to 5 volt USB jacks for cell phone charging and GPS. Have about 10 hours use on it and it hasn't varied in output.
I use these in various projects and they preform very well.I would highly recommend this item to anyone needing avariable DC voltage supply.
This product is extremely well made, and is very easy to use, a great product for low volt projects. I was confused at first, because you enter some kind of programming screen if you hold the buttons, and I still have yet to figure it out but if you just turn the small brass screw on top of the blue box that is the variavariable rresistor, it works quite well.
I am currently using this with a 12v car battery that fluxes from 12.38v to 11.5v and the output is a constant 9v. The adjustable output voltage screw moves the output voltage slow enough you can easily adjust tenth's of a volt and even possibly one hundredth (using a meter). Well worth the money, and I've already bought more.If it had to have a complaint, the display is lower than the caps on the board.
Used it to power a raspberry pi using a car battery. Worked well, easy to set up. Would recommend :)
Perfect companion to my micro controller bench. I initially bought it for experimenting with solar powered LEDs on a large outdoor sculpture (had to step down to 5V from the 12V from the battery). It was really convenient. I played with it a bit, however, I had a tight deadline and the board ended up being installed with the piece before I could get an fixed 5V buck, so now I need to get another one!
very nice unit, very close ranges, no adjustment was neccesary initially and I love the quick connects.
This voltage regulator is very good quality and does what its meant to do. The price was right and I do like how its put together. Worth the price.
Product works as advertised. I was able to adjust my voltage very easily, it is nice and small also, can hide it anywhere.
Picture shows two and I only got one. They need to fix this. I know it says one but this is very misleading!
Answer: You can use this to regulate power from the battery through this device to a powered USB hub that you install in your car.