... , 4 serial ports, 1 parallel port, 4 USB2.0, audio, 65536 Watch-dog, 16 routes digital I/ ... used in this board, it can work under 0~60 degree centigrade without cooling-fan. Onboard CPU ... 256MB SDRAM Support 4 COM and 4 USB2.0 Superior low power consumption, no CPU cooling fan ... Expansion InterfacePC/104(option) Watchdog Timer128 level programmable, 0~255second BatteryLithium 3V onboard I/O I/O Interface ...