400G QSFP112 Flat Top Riding Heatsink DR4 Transceiver Transceiver 400GBase-DR4 QSFP112 Flat Top for Riding Heatsink Transceiver (Parallel SMF, 1310nm, 500m, MPO-12 APC, DDM, C-Temp, IB and Eth, CMIS 5.x)