100/1000M Gigabit Ethernet Switch 20KM 4 x 1.25G Fiber Port SC 3 1000MBPS RJ45 Optic Fiber PCBA Board 4F3E PCBA Board WholesaleBuy Directly From Shop1103709371 Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.