Based on quectel industrial modules 2G M26; 3G-UG96&UC20; 4G-EC25 GSM: 850/900/1800/1900MHz or 900/1800 Mhz 3G: 900/2100/850/1900MHz 8 x SIM card(big/small) slots Speed: GMS 800-1000 sms, 3G 2500-2800 sms per port per hour Send and receive SMS,MMS Maximum transmitting speed 115KBps Input voltage: 100 to 240V Working temperature: -20 to +60 degrees Celsius Storage temperature: -25 to +70 degrees Celsius Double tone multi-frequency function(DTMF) Weight: 2.5kg