There are six 9 volt outputs, two 18 volt outputs, and two variable outputs, which are all isolated from each other. The variable outputs allow you to experiment with different voltages between 6 volt to 15 volt. different voltages can create interesting sounds with overdrive and fuzz.The main benefit of isolated outputs is that you can power 2 (or more) pedals that shouldn't be powered with the same output separately (for example: in most cases you shouldn't power more than 1 digital effect with the same output because this can create noise). The only disadvantage to me is that the iso brick is powered with an AC adaptor instead of a three pin power cable like other power distributors (example "T-rex fuel tank").
I Have owned two of these now both of them breaking with only light moderate usage. Nothing wrong with pedals plugged into them, no red led indicating poor connection just inputs slowly ceasing to work and a smell of burning plastic - may be dangerous who knows might burn your house down.
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