I need a USB hub to charge my devices.

I need additional USB ports to charge my iPhone, Pebble watch and Bluetooth headphones. I use the iMac's own USB ports to connect my external backup hard drive and my printer.
(1) The Amazon website says that USB 3.0 may interfere with wireless devices that run on 2.4mhz. I use an Apple wireless keyboard and also an Apple Magic Trackpad.
Will there be a risk of interference with the wireless keyboard and trackpad from USB 3.0? Amazon recommends using a USB 2.0 hub with 2.4mhz devices instead.
(2) For charging devices only, does USB 3.0 afford any advantage over USB 2.0? Data transfer is not an issue.
(3) Some USB hubs are powered directly off the iMac. Others have their own power supply that uses house power (120VAC).
Can I expect to recharge my devices off either a USB 3.0 or a USB 2.0 hub that gets its power only from the iMac?
Thanks in advance.
Dave

Non-powerer (USB bus-powered) hubs should not be used for charging multiple devices at the same time, because it will overload the iMac's USB bus.
If you are going to charge more than one devices at a time, then you really want a good self-powered hub or a device charging station.
In addition, not all self-powered hubs are created equal.
For example: I have had this > Belkin F5U259-ME /7-Port_USB_Hub for about 4 years and it charges all of my devices (iPods, Phone, RC helicopter, etc..) including my iPad when the display is in sleep mode.

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