What kind of USB hub do I need for my Meh Surface Pro 2?

Dizavid thought this was worth mentioning said
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See, my normal USB splitter works fine for just a mouse and keyboard, but I don’t want to chance trying it on my $70 entry level professional mic.

Some quick searching for “USB hub” has shown some nice looking results, but I’m not sure if something that doesn’t use external power would be safe to use for something like the aforementioned mic or an external hard drive. So what do I need to look for in a product?