Unit is Unused Perfect Condition. The AMC Optics QDD-400G-DR4-AMC 400G 500M module is a high-speed, single module designed for use in enterprise networking environments. With a maximum data rate of 400 Gbps, this module is compatible with various brands including Cisco, Dell, Arista, and Juniper Networks. The QDD model from AMC Optics offers reliable and fast data transmission, making it an ideal choice for businesses and networking professionals seeking high-performance networking solutions.