S.I.Tech 2174/2175 USB media pair extends the range of USB 2.0 beyond the USB 5 meter limit. The 2174 and 2175 are wireless and use radio waves for data transmission. The 2174 and 2175 are listed as Generic USB hub and provide a 4-port USB hub at distances up to 30 m over radio waves. The 2174 connects to host PC through USB type B connector. The 2175 connects to USB peripherals through USB type A connector.