R3000-4L is a rugged 2G/3G/4G router offering state-of-the-art mobile connectivity for machine to machine (M2M) applications. Dual SIM redundancy for continuous cellular connections, supports 2G/3G/4G. WAN link management: cellular WAN/Ethernet WAN/WLAN WAN backup. VPN tunnel: IPSec/OpenVPN/PPTP/L2TP/GRE. Supports Modbus gateway (Modbus RTU/ASCII to Modbus TCP). Supports SDK, provides user programmatic interface. Supports 802.1Q VLAN Trunk. l Supports PPPoE Bridge(IP Passthrough). Auto reboot via SMS/Caller ID/Timing. Supports RobustLink (Centralized M2M management platform, to a remote monitor, configure and update firmware). Supports RobustVPN (Cloud VPN Portal, to provide easy and secure remote access for PLCs and machines). Flexible Management methods: Web/CLI/SNMP/RobustLink. Firmware upgrade via Web/CLI/USB/SMS/RobustLink. Various interfaces: 2xETH / RS232/RS485 / USB / Binary I/O. Wide range input voltages from 9 to 60 VDC and extreme operating temperature. The metal enclosure can be mounted on a DIN-rail or on the wall, also with the extra ground screw. Antennas and power supply are not included. Refurbished device that was used for testing purposes.