The Eoptolink EOLD-134HG-02-N5 QSFP-DD 400G DR4+ 2km Optical Transceiver 400GB is a high-performance networking device designed for enterprise use. With a brand name of Eoptolink, this transceiver is capable of transmitting data at a speed of 400GB over a distance of 2 kilometers. It is a reliable and efficient solution for connecting servers and switches in a network environment, ensuring fast and seamless communication between devices. This QSFP-DD transceiver is a valuable component for enhancing the overall performance and stability of a network system.