does it run on usb power or do you need an additional outlet to keep it on?
1989120
Nope! It runs on the USB power so all you need to do is plug it into your PC.
2044011
It is USB and battery powered. It plugs into your USB port but the base of the unit (where the "on" switch is), has two AA batteries.
402438
It had a USB cord only. I had an extra USB to outlet plug around so it wasn't a big deal.
942779
It runs on the DC power of your vehicle's batteery . No additional battery required.
503189
It does not retain power so yes u have to keep it plugged to a power supply in order to power anything
1374740
It needs a power outlet. I believe you can plug it into a usb outlet or it comes with a adapter to plug into the wall.Refer to the 4th picture, power is in the middle.
1331295
It is powered off the USB bus. I use an adapter plugged into 110 volts to insure constant adequate power (because some USBs have more power than others).
390318
No it will not run off a wall outlet. It's suppose to be for your computer.. and since it's connected to the computer motherboard, it uses a DC voltage output from it.This is also not a USB fan. Based on your question, it's likely not what you want or need..
1827851
It is powered by a proprietary AC adapter and cable. It is not USB powered, and has no USB ports.
984015
No external power supply is needed. It is "plug & play". It gets power from the computer's ExpressCard/34 slot.
1059430
I am having trouble running it off AC power. The plug isn't designed well and it fell out of my power strip, so the battery ran out of charge totally. Now it's plugged in, but it doesn't want to work yet because the battery is not charged. So, it runs off the battery only, but you can try to keep the battery recharging as you use it by keeping it plugged in.
1696608
it runs off batteries you can plug it into the wall and charge it or your usb port
988053
It needs to be plugged in to a usb socket to be powered. No on/off switch thus nothing is charged.
2149499
Just USB powered but I haven't had any issues with it. Albeit, I only use it on rare occasions for work
1505886
It actually will plug into a usb port for power. It comes with a 120v to usb adaptor, but should run on anything with a usb output.
213679
It has an attached USB cord. No extra power cord. And BTW, especially for something so small and inexpensive, it sounds AMAZING!
1446522
It is powered by the USB port on your computer. There is no AC connection to worry about.