... includes RS232/485, TCP/IP, optional WiFi or GPRS. Optional built-in 2000 mAh battery eliminates the trouble ... continuous operation.Optional built-in wireless Wi-Fi or GPRS for wireless communicationBuilt-in contacts for 3rd party electric ... card, Extendable Scheduled-bell, Short Massage, Web-server, GPRS,WIFIPower supply12V3AVerification Speed≤2 secOperating temp0°C- 45 °COperating Humidity20 ...