Does the power adapter have to be plugged in if I have devices that don't require power?
458954
No, if for instance you're using the 4-Port on a laptop, you can plug in a wired mouse. However, if you are trying to plug in an external dvd drive, then it won't work without the power adapter being plugged in. I don't have a desktop but that's what I found with my Macbook Pro. Hope this helps. Also, be aware that the adapter cord is about 3' long.
458955
No. The power adapter is only needed if the devices connected to it require more power than the port on the computer can provide.
1800550
No you have to use the power adapter supplied. Unless you rigged up a 12 volt DC battery near it.
842171
If your using an external USB device that has its own power supply (i.e. external HD that plugs into the wall) I'm pretty sure you don't need to power this card.
2043311
No, it does not. It won't function as a hub without the power source either (at least not to devices that require power, eg, my WiFi card)
2087816
Absolutely not. Both the device and the laptop receive their power through cords connected to a power strip.
942013
This unit is USB powered, does not need to be plugged to an electric outlet. The computer this device it connected to will power the unit using the USB cable.
1955004
Not sure what you mean by 'adapter'. If you're referring to AC power supply, yes it plugs in.
1558715
it does not need a power adapter. will power up with out one. so far this hard drive has been really good
837086
This does require a power cord, for each adapter. The power cords are included in the purchase, but you will need to be able to plug the adapter as well as the LED light connected to it.
836519
Hello Susan. No, it isn't it needs to be connected to power. It's very nice but I don't consider it portable.
23300
No. It gets its power supply from the raspberry itself. No need for external power
121995
No, it doesn't. It's necessary for the unit to be plugged in to a power outlet for use.
12284
No it functions fine without it BUT if your device requires allot of power like a passport hard drive you will be required to hook up power. Most devices like Flash drives, mice, keyboards, Ect don't
1089889
Yes, it can be used without connecting the power adapter if your USB device power requirements are low enough. The only power available in that case would be the power supplied by your USB port on the computer, usually only 500 ma.
1648456
YES. It draws no power unless a device is attached. Cables only attached drew no power. I used a Kill A Watt to confirm. Hope this helps.
160107
It requires a power adaptor to be plugged, but one comes with the item, however you will need an AC outlet nearby as the power cord is only 30 ins long or you can attach it to an extension cord.
355998
Nope. It needs to be powered. I could only get one item at a time to work. If I had 2 or more things plugged in, it wouldn't work at all.