Does it work by plugging in via USB or does it need power from an AC plug?
343796
To my knowledge, the larger ones (1TB +) seem to have external power. The smaller ones (less than 1TB) are just powered by USB. Those are the ones I have anyway.
528564
That other answer is not entirely correct. A powered hub can operate on USB power only. It does not NEED to be plugged into AC. It will work the same as an un-powered hub, which will limit you to a total of 500mA of current draw from all ports combined. However, if you use the AC adapter then you will have up to 500mA per-port (2A total). So if you are only going to connect low powered devices, or self powered devices, then the AC adapter can be considered optional. If you need to connect devices that draw more power (portable hard drives, USB powered scanners, burners, etc.) then you would need to use the AC adapter to supply the additional power.
1493737
This was a gift for my son, and he said it works without being plugged in, with being plugged into an outlet, and it works being plugged into a computer. I hope this helps.
2150684
It's AC power only, in other words, you need to plug in to the wall socket.
528563
That other answer is not entirely correct. A powered hub can operate on USB power only. It does not NEED to be plugged into AC. It will work the same as an un-powered hub, which will limit you to a total of 500mA of current draw from all ports combined. However, if you use the AC adapter then you will have up to 500mA per-port (2A total).So if you are only going to connect low powered devices, or self powered devices, then the AC adapter can be considered optional. If you need to connect devices that draw more power (portable hard drives, USB powered scanners, burners, etc.) then you would need to use the AC adapter to supply the additional power. That other answer is not entirely correct. A powered hub can operate on USB power only. It does not NEED to be plugged into AC. It will work the same as an un-powered hub, which will limit you to a total of 500mA of current draw from all ports combined. However, if you use the AC adapter then you will have up to 500mA per-port (2A total).So if you are only going to connect low powered devices, or self powered devices, then the AC adapter can be considered optional. If you need to connect devices that draw more power (portable hard drives, USB powered scanners, burners, etc.)... » Read More That other answer is not entirely correct. A powered hub can operate on USB power only. It does not NEED to be plugged into AC. It will work the same as an un-powered hub, which will limit you to a total of 500mA of current draw from all ports combined. However, if you use the AC adapter then you will have up to 500mA per-port (2A total).So if you are only going to connect low powered devices, or self powered devices, then the AC adapter can be considered optional. If you need to connect devices that draw more power (portable hard drives, USB powered scanners, burners, etc.) then you would need to use the AC adapter to supply the additional power. « Show Less
2254164
Yes, it needs to be plugged into a 12 volt "cigarette lighter" power outlet to work.
1482790
All power comes through the USB.No, it is not WiFi/wireless. It has to be connected via USB cable to computer.
976694
No, it comes with an AC adapter which need to be plugged in an available wall socket.
2148283
You need to plug into an outlet for it to work. The outlet is not included.
1827851
It is powered by a proprietary AC adapter and cable. It is not USB powered, and has no USB ports.
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).
1584765
It requires a standard AC outlet. It does not plug into USB at all, it gets the audio from a headphone outlet.
1255034
It appears to work powered by the AC adapter or the USB 3.0 cable alone. My USB 3.0 external hard drive works without the AC adapter. However in order to charge attached devices like my mobile phone, the AC adapter has to be plugged in.
121995
No, it doesn't. It's necessary for the unit to be plugged in to a power outlet for use.
1691328
Yes. Plugs in wall via USB connection or you can use a USB power source such as a computer or TV.
498032
Hi, Thank you for your question. It uses 110V AC power. It is not USB powered. Thank you.
1352718
No sadly it can't be powered by USB. You have to either use the AC adapter or use 4 AA batteries.