... router, 3g sim router, huawei wireless sim router, dual card wifi router, 3g+wifi router, dual 3g+wifi routerWCDMA SpecificationItemContentCellular ... MDI/MDIX, 1.5KV magnetic isolation protectionSerial1 RS232(or RS485/RS422) port, 15KV ESD protectionData bits: 5, 6 ,7, ... protection(optional)SIM/UIM2 standard 3V/1.8V user card interfaces, 15KV ESD protectionPowerStandard 3-PIN power jack, reverse ...