100GBASE-LR4 10km QSFP28 optical transceiver is designed for use in 100Gb Ethernet links up to 10km in data center, Telecom, service provider long-distance transmission applications. 100% compatibility, competitive price and global shipping. #lr4 #100g #QSFP28 https://www.glsunmall.com/product/qsfp-100g-lr4-s-optical-transceiver-module.html