Sabrent 4-Port USB 2.0 Hub, Silver (SBT-U2HA) Add USB devices to your PC with self-powered 4-port USB 2.0 hub Fully compliant with USB 2.0 specifications and backward compatible with USB 1.1 devices Blue LED indicates activity Data transfer speeds up to 480Mbps 4 downstream ports support high-speed (480Mbps), full-speed (12Mbps) and low-speed (1.5Mbps)