New and unused. These are used in many different cell switching, router, base bands, and other networking and cell gear deployments, can be used in many other networking applications. These were left over back stock never used.The T-Mobile Finisar FTLF1421P1BTL-NN 471546A.101 1310nm Fiber Optic Transceiver is a high-quality component designed for computer networking systems. Manufactured by Finisar, a reputable brand in the industry, this transceiver is essential for efficient data transmission over fiber optic cables. With a wavelength of 1310nm, it ensures reliable and fast communication for a variety of networking needs. This product is a crucial part of any computer system requiring fiber optic connectivity for optimal performance.