Kingwin 23-In-1 Universal Card Reader/Writer Flash Memory Card Reader, KWCR-506 Up to 480 Mbps data transfer rate in USB 2.0 Support hot plug and play 4 Slots multi-function flash reader 5 Indicators for easy recognition USB Bus-powered, no external power supply required Support OS: Win98SE/2000/ME/XP/Vista/7 Mac OS 8.6 or higher