Features: Tiny, compact, light weight and fashionable design 4 USB 2.0 ports for easy expansion Allows connecting at least 4 different USB devices 40 times faster than USB 1.1 products Guarantees 12Mbps bandwidth to each port for USB 1.1 devices Plug-and-play and hot swappable functions Backward compatible with USB 1.1 specifications Over current protection LED indicator for easy status monitoring A-B cable tucks away when not in use Warranty: 3 years Specifications: Transfer rate: 480Mbps Power connections: DC adapter Power consumption: 5.0V Ports: 4 downstream Cable length: 2.0-inch (5.0cm) Humidity: 20 to 80%RH (non condensing Operating temperature: 20 to 50°C Storage temperature: 0 to 70°C Requirements: For PC users: Windows?98SE, 2000, ME and XP OS For Mac users: Mac 8.6 or greater OS Requires OS X for USB 2.0 interface