Product highly rated, so I did not hesitate to buy it. But on arrival: Unrecognized device with Windows 7 and Mac OSX Mavericks if you connect consumer appliances energy (USB 2.0 hard drive, recorder BR) ... It works with USB drives (DD, BlueTooth etc ...). The notice is that the EC declaration of conformity, no link to any website, and mystery on the characteristics. In short, without external power, it only serves as a pretty blue lighting!