Three-port USB version 1.1/ 2.0 Hubs in revolving USB connector Slimmest design for portable usage luminous LED indicator inside USB plug Fully supports SD/MS memory card reader and writer Compliance with USB 2.0 full-speed, 12Mbps and low-speed 1.5Mbps operations For PCs, Notebooks, palmtops, PDAs with USB port Supports auto-detecting slot with card inserts on Windows 2000 and XP without driver Compliance with Microsoft Windows 98SE, ME, 2000 and XP, Linux 2.4 or later, Mac OS 8.6 or later Reader and writer supports: smart media, multimedia, secure digital card, memory stick, MMC, mini SD and RS-MMC External power is not required Hubs up-stream and down-stream, USB A male plug x 1, USB A female jack x 3 Color printed logos are accepted Dimensions (L x W x H): 79 x 50 x 12mm Perfect for promotional purpose or as commercial gifts