The CRS305-1G-4S+IN is a compact yet very powerful switch, featuring four SFP+ ports, for up to 10 Gbit per port. The device has a 1 Gbit copper ethernet port for management access and two DC jacks for power redundancy. The device is a very sleek and compact metallic case without any fans, for silent operation. The device has a “Dual boot” feature that allows you to choose between two operating systems - RouterOS or SwOS. If you prefer to have a simplified operating system with only switch specific features, use SwOS. If you would like the ability to use routing and other Layer 3 features in your CRS, use RouterOS. You can select the desired operating system from RouterOS, from SwOS or from the RouterBOOT loader settings. All the feature set comes with a disruptive price, providing the best price/performance on the market. Mikrotik 24HPOW 2 UNITS hi-power supply 24 vdc, 38 watt (1.6 amp) Supports all Routerboards heavy duty switching power supply with 2.1mm DC plug. Uses standard USA AC input power cord (included) and operates from 100 to 240 vac. UL approved for use in the USA. Supports all Routerboards except the RB500 series. Use with the RB/P54 POE injector for POE support.