Used Brocade 40G QSFP+ SR4 optical transceiver, in excellent condition. I purchased this but ended up using 10G, so I never used the 40G and it has been stored long-term. This is for one unit. I have two, so please inquire if you need multiple. - Brand: Brocade - Model No.: 57-1000128-01 - Connector Type: QSFP+ - Optical Interface: 40GBASE-SR4 - Maximum Data Transfer Rate: 40G