HAILI Gigabit Ethernet Media Converter Single Mode Fiber Transceiver 10/100/1000Mbps Fiber Media Converter with Double RJ45, Single SC Port, 5V External Power Supply, 2 Pack

Works straight out of the box. Connected the devices to my 100M spool of fiber cable then ran some data through via the internet - no loss in signal or bandwidth performance. These came with euro plugs so I had to get UK adapters. So far so good.