Dual SIM redundancy for continuous cellular connections; supports 2G/3G. VPN tunnel: IPSec/ OpenVPN. Supports Modbus gateway (Modbus RTU to Modbus TCP). Auto reboot via SMS/ Timing. Flexible Management methods: Web/CLI/SMS. Firmware upgrade via Web/CLI/SMS. Various interfaces: RS232/ RS485/ Ethernet. Wide range input voltages from 6 to 26 VDC. The metal enclosure can be mounted on a DIN-rail, on the wall or be put on desktop. Antennas and power supply are not included. Refurbished device that was used for testing purposes.