4 DLink DEM-CB100S V.E1 - TESTEDThese were in used in my DLink PoE switches. I was the user. I was the uninstaller. These work.The product is a lot of 4 D-Link DEM-CB100S V.E1 SFP+ connectors in black color. These connectors have a cable length of 3 feet and are designed for optical fiber cables. They are specifically designed for networking cables and adapters, making them suitable for computer connections. The connectors are compatible with SFP+ ports, providing a reliable and efficient connection for high-speed data transfer. Ideal for use in networking setups, these D-Link connectors offer a dependable solution for connecting various devices.