I wasn't sure if it would work as a charging cable for my MP3 player which uses a mini USB port for charging. One of the description options states that it cannot be used with an external power supply. I wasn't sure what the hell that meant. But one review said it was used to charge some game controllers, so I figured they'd probably work. They actually work great as charging cables. The cord is 11 inches long from tip to tip. The cable seems solid enough and both ends of the connector fit well. I don't know what else to say about her.