Features:* Can be expanded into a USB interface to four independent USB interface to expand the work of four USB interface， each supply up to 500MA* Use the second generation USB HUB controller* Directly connected to the computer， no external power supply， easy to use* Computer automatic identification installation， no drivers， plug and play， plug* Support USB1.0 / 1.1， compatible with USB2.0， speed up to 12Mbps* Built-in current overload and short circuit protection device* System support: Win95 / 98 / Me / 2000 / XP， Linux2.4andMac os8.5 or later* Streamline ultra-miniature design， cross-sectional area 38x45mm* Use high-quality electronic devices to ensure stable operation.Random colors classic design， exquisite shell， support hot-swappable， low power consumption. Products applicable to U disk， card reader， USB mouse， USB keyboard， scanner， digital camera， digital camera， USB sound card， hard disk boxes and other equipment to expand four USB interfaces， each supply up to 500Ma， using a second generation of USB HUB controller， without driver， plug and play， supports up to 127 USB devices， all with a high-quality electronic devices to ensure that products work and stability.