USB Revision: USB 2.0 (Backwards Compatible With USB 1.1), Data Transfer Rate: up to 480 Mbps, Max Output: 2.5W (5V/0.5A) across all 4 ports, Cable Length: 25cm, Dimension: 9.5 x 3.0 x 1.0 (cm), Operation Temperature: 0 - 40°C, System Requirements: Windows XP and above, MacOS 9.1 and above, Linux. CH241 4-Port USB 2.0 Hub is a simple and fast way to add four USB-A ports to any desktop or laptop computer, expanding connectivity for keyboards, mice, printer and other peripherals.