Source Mikrotik CRS305-1G-4S+IN metal redundant power supply 4 SFP Ports Up to with one Gigabit Ethernet port and 10Gbps desktop switch on m.alibaba.com
MikroTik CRS305 1G 4S+IN Switch - ServeTheHome
MikroTik CRS305 Switch (4 SFP+ Ports)
MikroTik CRS305-1G-4S+IN 10 Gigabit Five Port Intelligent Network Managed Switch Metal Redundant Power Supply - AliExpress