With these USB hubs you can quickly and easily add 4 USB ports to your PC or Mac. Each port complies with USB standard 2.0 and thus offers a data transfer speed of up to 480 Mbit, which is 40 times faster than the conventional USB standard 1.1. The hubs offer all the advantages of USB: all connected devices... are recognised directly by the hub, without any complicated or time- consuming installation - true plug <(>&<)> play. In particular, working with peripheral devices such as scanners or printers that comply with the USB 2.0 standard is made easier. Gone are the days when you had to pay for the convenience of USB installation with a loss of speed. The DUB-H4 and DUB-H7 can also be used for connections with USB Standard 1.1 devices without any problems. They regulate the data transfer so that the speed can also be optimised in the "older" USB standard. The hubs have 4 Type A downstream ports for connecting USB peripherals or other USB hubs and one USB Type B upstream port for connecting to the computer. By cascading several hubs, up to 127 USB devices (scanners, cameras, etc.) can be connected. Extensive diagnostic LEDs always indicate the port status.