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Operating temperature -30 to 80 Operating Voltage 3.3V-4.2V Power Voltage 3.4V Standby average current 3ma the following Stand by GSM / GPRS Four bands, including 850,900,1800,1900MHZ GPRS Class 10 Sensitivity -105 Support voice calls Stand by SMS SMS Stand by GPRS Data services, the maximum data rate, downloads 85.6Kbps, Upload 42.8Kbps Supports standard GSM07.07,07.05 AT Command and Ai Thinker Extended Command Stand by 2 A serial port, a serial port to download, a AT Command port AT Command supports standard AT and TCP / IP Command interface It supports digital audio and analog audio support HR , FR , EFR , AMR Speech coding Stand by ROHS , FCC , CE , CTA Certification SMT 42PIN Packaging