Description: Adds 4 high-speed USB 2.0 ports. Laptop USB hub is fully compliant with USB 2.0 specifications Backward compatible with USB 1.1 The mini USB hub to; 4 ports supports up to 127 high-speed devices Support data transfer rate at 1.5/12/480 Mbps Individual port overcurrent protection User-friendly and ergonomic design Computer USB hub is easy to use. transport Supply up to 500mA per port enough for various devices Plug and play Specification: Material: ABS shell + copper Application: computer USB interface Specification: USB 2.0 / 1.0 compatible Humidity operating voltage: 10% - 90% Operating voltage: 5V Working current: 500mA Operating temperature: -20C - 75C Storage temperature: -40C - 85C Support system: Windows 95/98/2000/2003/ME/XP/Vista or OS 8.1 or later (Windows 95/98 system to install driver) Color: black , white Weight: 49g Cable length: 15.7inch/40cm Specifications: Adds 4 high-speed USB 2.0 ports. Laptop USB hub is fully ;fully compliant with USB 2.0 specification Backward compatible with USB 1.1 Individual port overcurrent protection Plug and play Package includes: 1 x USB Hub 2.0 High Speed 4 Port Notes: Due to the difference between different monitors, the pictures may not reflect the actual color of the item. Compare the pictures detail sizes with yours, please allow 1-to-1 error. 3cm, due to manual measurement. Please leave a message before you give bad feedback, if the products have any problems. Thanks for your understanding