Extreme USB technology extends the range of USB 2.0 devices up to 1650 meters (500 meters) using fiber-optic cable Remote extender 400FOR is equipped with 4 USB ports Provides support for both low-speed and high-speed USB devices Comes with a USB cable, power adapters and user guide Fully compliant with USB 2.0 specification as certified by the USB Implementers Forum Number of devices can be expanded using standard USB hubs