Instruct: Classify an Amazon review into positive or negative sentiment.
Query: It works but doesn't provide power really, it's a silly concept.

Imagine you have your USB device plugged into this thing for extra power and you need a bit of extra power for those surround sound USB headphones. Well the idea of the batteries charged up to help with the device sounds good, but it's really silly. Since a USB power cord can't power up the headphones well enough then how you you expect the battery to help do it when it will just drain in like 1 hours time of extra useage. The battery can't recharge while it's be overwhelmed and drained of the extra power the USB can't put out enough power as it is for the headphones alone let alone how is it going to recharge these while it's still in use also.The batteries in mine where over heating to the point I was affraid to use it anymore, Cyberpower sent me a 110v powered plug in stand alone hub as a replacement.