Proscend's Industrial 4G LTE Cellular Router M331 comes with 3 Gigabit LAN ports, 1 Gigabit WAN port and dual SIM support to enable critical industrial applications and reliable IoT connectivity for optimal performance and network redundancy. The M331 is designed with rugged compact enclosure for DIN-rail or wall mounting to install where tight spaces, as well as features digital I/O, serial ports (RS-232, RS-485), DC and AC power inputs to provide flexible applications in demanding environments.