?Easy to install?It supports real-time configuration, plug and play, hot pluggable sfp footprint. It doesn't require any setup or installation for either device. It greens up immediately and connects right away. When install sfp, please rotate the latch down at a 90 degree to unlock your sfp transceiver. Attention not to look directly into the sfp interface when it's plugged in the network device. ?CWDM4 vs LR4?The main difference is the working wavelengths and transmission distance. For 100GBASE-CWDM4 QSFP28, the operating wavelength of is 1271nm, 1291nm, 1311nm, 1331nm, wavelength interval is 20nm, and transmit up to 2km; For 100GBASE-LR4 QSFP28, the operating wavelength is 1295.56nm, 1300.05nm, 1304.58nm, 1309.14nm, wavelength interval is about 5nm, and transmit up to 10km. They are not recommended to be interconnected with each other. ?Connector&Cable?100GBASE-CWDM4 QSFP provides 100GBase-CWDM4 throughput up to 2km over single-mode fiber (SMF) using a duplex LC/UPC connector. 100G CWDM4 module can be connected to 1310 special port of CWDM MUX for signal transmission, CWDM4 QSFP uses 4 different CWDM channels at 1271, 1291, 1311, and 1331nm. ?4 CWDM DFB?100GBASE-CWDM4 QSFP28 Optical Transceiver Module,103.1Gb/s, each lane bit rate 25.78 Gb/s, 100GBASE Ethernet, up to 2km over single mode fiber (SMF) with duplex LC connectors. 4 CWDM lanes MUX/DEMUX design four wavelengths at 1271, 1291, 1311, 1331nm. ?100% Compatibility?It's 100% compatible for almost all Extreme 100GBASE-CWDM4 Standards devices, coding as Extreme 100G-QSFP28-CWDM4-2KM.