Power: DC 9V~28V LAN: Connect to PC with crossover Ethernet cable USB interface: U-Disk (up to 2G), USB mice, USB keyboards SD card: Up to 8G Serial:RS232 and RS485 ST-eWin7000 can be a displayable terminal control device and connected to subordinate computer (MCU) through RS232. The advantage of separating display interface from control system is making the systems independent and upgrading conveniently. Audio output port: Connect to Stereo headphone output or speaker www.stone-lcd.com