The Digi Transport WR21 is a truly flexible and compact GSM/EDGE/HSPA/HSPA+ cellular router. With its many options, you can select the most cost effective solution for your application; be it basic device connectivity or an enterprise class routing and security solution. Hardware options include dual Ethernet ports for cellular WAN backup, and an RS-232/422/485 software selectable serial port, whilst software options include standard basic routing and IP filtering or enterprise advanced routing protocols, VPN and stateful firewall. Suitable for both enterprise and industrial applications alike, the WR21 can be either desktop or DIN-rail mounted, has an operating temperature of -35°C to +75°C, has dual SIM slots and a best-in-class 5 year warranty.