1.Dual SIM & VPN Security Equipped with dual SIM card slots for seamless network failover and enhanced connectivity. Built-in VPN support ensures secure data transmission for industrial IoT applications like smart grid monitoring and POS systems. Transmission Distance can reach to 80 meters. Support multiple WAN access methods, including static IP, DHCP, PPPOE,3G/UMTS/4G/LTE, DHCP-4G. Supports UPnP, Dynamic DNS, Static Routing, VPN (PPTP, L2TP, IPSEC, GRE. 2.Ruggedized Industrial Design for Extreme Environments Crafted with 32-bit industrial-grade CPU and IP30-rated aluminum casing, Working Voltage DC 5V to 36V, this 4G LTE router withstands temperatures from -40°C to +85°C. Features DIN-rail mounting, ESD-protected interfaces (RS232/485/Ethernet), and 15KV surge protection for harsh industrial deployments. 3. Extensive 4G LTE Coverage & Multi-Protocol Support Supports multi-LTE bands including B1/2/B3/B4/B5/B7/B8/B28(FDD) and B40(TDD),HSPA+/HSUPA/HSDPA/WCDMA/UMTS 210