"Scope of delivery; 4-port Hi-Speed USB 2.0 hub; Power adapter; USB 2.0 cable". Adapter is included. That's not correct. This is NOT a powered USB hub. If you check the items sold by Arkview on Revain, it seems you can't get an "extra power supply" from buy them at least not on Revain I'm sure it would be negligible for low requirements, although plugging it in I got red warning lights not the nice blue 'Aqua Flow' as promised in the picture. :) It installed without any problems but the computer didn't recognize anything plugged into it Okay Returned today.
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