Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Wow, a charger for a peripheral that can be charged by plugging it into the piece of equipment it comes with...

That pretty much explains the usefulness of this product.Seriously, your controller can be charged from the PS3 itself when plugged in by the USB cable IT COMES WITH! The separately bought controllers don't come with USB cables, but you can buy any mini USB cable in bulk from Sam's or any electronic store that you can use for anything with a USB port, EVERYWHERE!