IT ALLOWS YOU TO CHARGE VIA USB! It should, of course, be noted that it will probably not charge as fast as it would with the OEM charger or any 2 amp charger. But it does work. It didn't take long to get it (they ship from Hong Kong) and the price is worth it. I have also used it with my Sharper Image portable power pack with success. May have to get myself another one as a backup.