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This is the fiber optic cable for the fiber optic Ethernet devices. It has SC/UPC connectors at both ends. The fiber optic is 9/125 μm. This sample cable is just 3 m long, of course for the actual link you need a longer cable, we suggest to take at least 20 m however you can measure the length needed and buy the cable according to that, there are cables of 3m, 5m, 10m, 15m, 20m, 30m, 50m. The 20 m cable costs about 10 EUR with free shipping from Aliexpress. The only problem with Aliexpress is that the free shipping is very slow, it may take 2 months. This cable is very flexible, just 3 mm thick, however it must not be bent too much or it will deform irreparably and the light won't pass through it anymore. Also it is easily damaged by heat, so it must never pass close to heat sources, like hot water pipes or incandescent light bulbs.