The SC-SC(Subscriber Connecter) Multimode Duplex Optic Adapter is designed to connect two optic fibers on each side so that a signal may pass between them. It is a white, plastic piece with included ferrules for signal quality. When using this adapter, you will have lower insertion and return loss. This adapter comes with our Signature FireFold Lifetime Warranty, covering the product from any manufacturer defects. Limit your network to your imagination, not your optic fiber.