This is a Finisar 2GB 850nm SFP GBIC transceiver module. Its part number is FTRJ-8519-3-2.5. This item is new and has never been used. It was originally bulk packaged and we have repackaged it for individual sale. It comes as pictured and does not include any additional parts or accessories. Specifications: Manufacturer: Finisar Part Number: FTRJ-8519-3-2.5 2GB 850nm SFP GBIC Transceiver