Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: why can't this charge my iPad mini with retain display. it charge my iPhone 5s, and my iPod
Document: However, the USB ports are not powered, so can't sync and power up iPhone, iPad,iPod, etc. as I was hoping from reading the entry in amazon
This can't charge my iPad(which I know is indicated, my fault) and sometimes my iPhone also doesn't work. The problem with this is if you plug in something that is even slight heavy, it knocks this off.
I like this USB hub, I just wish it would charge my iPad and iPhone. I own a Mac mini so all the USB ports are on the back unit. I have a lot of Devices so this little device has been very nice for me.
I bought the new mac mini - which is under my desk top on a lower shelf. Getting to the USB slots on the mac mini (rear) wasn't ideal - so I saw this device online and found it listed on amazon. Very light, works perfect, looks good sitting up top the mac mini. The ONE negative, my iphone & ipad DO NOT charge using this USB hub.
This phenomenon does not occur with my iPhone 4s or iPod classic, which both charge and sync like a dream, but I was really looking for a hub that would enable charge & sync capabilities for all of my devices.
I like this Satechi hub quite a bit. It plugs into my 30" cinema display connected to my Mac Pro tower, and the look of the hub fits the hardware. I use the hub primarily to connect multiple USB keys (iLoks, ignition key, eLicenser) related to music production software. These dongles do not require significant power, so I can't comment on it's ability to power and charge devices.
Nice addition to my new iMac! This device gives me 4 ports to plug in my iPhone, iPad Air and iPad Mini. Love it.
Looks beautiful but it doesn't provide enough power to charge an iPad. It will provide enough power to charge an iPhone but not the iPad. Very disappointing.
Second unit I have purchased! One for Macbook Pro and now this one for my iMac. Works like a charm, would highly recommend it, no external power needed. Note it will not charge your iPad but will on iPhone....  Great product.
The short cord and light weight means it is difficult to locate and keep in place.It is not powered, and offers no option to be powered. I knew that buying it, so it's not so much a defect, it's just a limitation. It would be nice to have an optional power input, to allow me to charge my iPad or iPhone while at my computer.When it comes to looks, it is just about perfect.
Answer: Probably insufficient power...I use this for input/output, not charging.