The Sharp PC4SD21YXPDH is a 4-Port Gigabit Ethernet Switch designed to offer advanced networking capabilities for home, office and mid-level networks. It features four Gigabit Ethernet ports with speeds of up to 1Gbps each, Auto-MDI/MDIX for easy network wiring and configuration, and data flow control for smooth data communication between multiple devices. The PC4SD21YXPDH is designed to provide reliable and secure wired connections with the highest level of performance and security.