Arista QDD-400G-FR4 Compatible 400GBase-FR4 QSFPDD Transceiver (SMF, 1271nm to 1331nm, 2km, LC Duplex, DDM, C-Temp).- Guaranteed Compatible: In System tested in over 90 OEM switches, routers and servers.- 99.98% Reliability Rate: Functionally, optically and environmentally tested to exact specifications.- Industry Leading Lifetime Warranty: For more information by product line, visit our Warranty page.- 98% On-Time Delivery Rate:Extensive inventory guarantees samedayshipping- Full Service Technical Support: Call,chat,email or meet for expertopticalconnectivity support.