Plugable Aluminum SuperSpeed USB 3.0 12-in-1 6 slot Memory Card Reader (Including UDMA CF and UHS-I SD, SDXC, SDHC, MicroSD) Attractive, durable brushed aluminum finish beautifully complements Apple systems. Supports most common media card types: CF, SD, SDXC, SDHC, MicroSD, XD, MemoryStick, MMC, M2 Flashing activity LED indicates file transfer in process Drastically improved connection speeds compared to older USB 2.0 card readers USB Bus Powered: no external AC power supply required