4G with one SIM slots for cellular WAN 4 Fast Ethernet LAN ports ensure reliable connectivity and reduce extra switch cost? Plug & Play design for quick and easy integration Durable zinc-plated steel case is corrosion-resistant to ensure device longevity? -30 to 70°C operating temperature to resist harsh environments? Wall or DIN-rail mounting allow for optimal device placement. D-Link Corporation, No. 289, Sin Sin Road, Jhonghe City, Taipei County 235, Taiwan (R.O.C.), Podpora: https://www.dlink.com/cz/cs/support