led Working temperature -30 ° to + 80 °;
   l Operating Voltage 5V;
   l Standby average current < 3ma;
   l support the GSM / GPRS four bands, including 850,900,1800,1900MHZ;
   l GPRS Class 10;
   l Sensitivity <-105;
   l support voice calls;
   l support SMS text messaging;
   l Support GPRS data traffic, the maximum data rate, download 85.6Kbps, upload 42.8Kbps;
   l Supports standard GSM07.07,07.05 AT commands and extended commandsAi Thinker;
   l supports two serial ports, a serial port to download an AT command port;
   l AT command supports the standard AT and TCP / IP command interface;
   l support digital audio and analog audio support for HR, FR, EFR, AMR speech coding;
   l support ROHS, FCC, CE, CTA certification;
   l SMT 42PIN package.