All in One USB 2.0 Frosted Surface Memory Card Reader (Blue) for Lenovo laptop USB connector & extension cordLED indicator lightsSupports 64 types of memory cardsPlug & Play and Hot-Swap FunctionsSlot-to-slot read/write operationAuto-detecting slot while card is insertedUSB 2.0 high-speed transfer rate up to 480 MBps downwards compatible with USB1.1OS support: Windows 98/ME/2000/XP Mac OS Linux Windows 7Bus-power for card reader. None extend power need