... · Back-up Battery:2000 mAh· Communication: TCP/IP, RS232/485· USB-HOST: Two · T&A functions: Extendable Scheduled-bell, DLST, Self ... , door sensor, exit button, Wiegand output, · Optional functions: WIFI, GPRS, serial printer, Mifare/HID/iClass, backup battery` Power Supply: 12V 3A ...