28-port L2 managed Industrial PoE Ethernet Switch, 24*10 / 100 / 1000M RJ45 copper PoE ports, 4*GE SFP/copper combo ports Power supply: AC110-240V; PoE budget: 400W Wide operating temperature:-40℃~80℃; Supports ring network(STP/RSTP/MSTP/ERPS); Supports WEB/CLI management, supports SNMP and VLAN; IP40 Aluminum shell; Rack-mount