... Flash memorySystem Memory 128MB DDR SDRAM memory SD / MMC Card Socket,Support Micro SD host interfaceSerial Ports Support 2 x 3 ... (RJ45) 2x USB device, ix USB host , 1x DC Power port and 1x Power switch , 1x Microphone Jack, 1x Buzzer Port Built-in ... metal or equivalence for EMC / EMIPower Management DC9V~DC36V power requirement with short-circuit protectionOperating Temperature -30 °C ~ +80 °C ...