RB750UP is a small five port ethernet router in a nice plastic case, the UP model includes a USB 2.0 port and PoE output. Ports 2-5 can power other PoE capable devices with the same voltage as applied to the unit. Less power adapters to worry about. ..
RB750P-PBr2 is an outdoor five port ethernet router with PoE output on four ports. The device has a waterproof outdoor case. The unit has five shielded Ethernet ports, four of which can power other PoE capable devices with the same voltage as applied..