400G-LR4 QSFP56-DD based on EML, 8 channels of 50G-PAM4 electrical and 4 channels of 100G-PAM4 optical parallel lanes,duplex LC connector, 10km maximum reach via single mode fiber,case temperature range of 0℃-70℃, comply with IEEE 802.3bs and QSFP-DD MSA standards, and support CMIS. Products are mainly used in 400G Ethernet, data centers and cloud networks.