Descriptions: - Provides 4 USB interfaces. - Fully compliant with USB specification version 2.0 (USB 2.0 Compatible with USB 1.1) - ON / OFF switches activate or deactivate individual ports. - Built-in current overload and short circuit protection device. - The use of high-quality 01lectronic devices to ensure stable operation. - Computer Automatic Identification installation, no drivers, plug and play. - Support: windows95 / 98 / ME / 2000 / XP / Vista, Mac 8.6 or later. - LED indicator lights show which USB ports are in use at any given time. - Operating voltage: 5V - Bus-power limit current protection: 500mA - Individual power switches for the energy save,suitable for flash drive, digital camera, DV, #32audio devices, monitor, input devices, etc.