RouterOS L5 Firewall/Routing; Atheros AR7161 680MHz CPU; 128MB DDR RAM; Onboard NAND, microSD storage; Three 10/100 ethernet ports MDI/X; Three miniPCI Type IIIA/IIIB slots; Power: 9-28V DC; Overvoltage protection; PoE: 12-28V DC (no power over datalines); 150mm x 105mm (5.9in x 4.13in)