... Multi-model communications includes RS232/485, TCP/IP, optional WiFi or GPRS. Optional built-in 2000 mAh battery eliminates ... continuous operation if power cut.· Optional built-in wireless WiFi or GPRS communication makes easier device installation without wiring ... , door sensor, exit button, Wiegand output, · Optional functions: WIFI, GPRS, serial printer, Mifare/HID/iClass, backup battery· Power ...