4 SuperSpeed USB 3.0 ports support data transfer rates of up to 5Gbps. (Note: actual rate will depend on the capability of your device.) Backward compatible with USB 2.0 / 1.1. * Additional power port (2.1A) offers enough current to charge both a smartphone and a tablet at high speed. USB 3.0 ports supply 0.9A each. * Built-in surge protector safeguards your devices, while respiring LEDs display the status of all connections. High-grade chipset and 36W adapter guarantee steady operation. * Supports Plug and Play and hot swapping. No installation of drivers required for Windows XP / Vista / 7 / 8 or Mac OS X 10.2 and above. * Package includes: USB 3.0 4-Port Charging Hub, 12V 3A power adapter(with 3.3ft cord), 3.5-foot USB 3.0 cable, user manual. Free lifetime technical support and 18-month manufacturer"s warranty.