SIM900/A V4

• Arduino 51 STM32 AVR MCU compatible
• 3.5mm speech and Mike interface
• Prototype expand
• The dual frequency 900/ 1800 MHz, GPRS multi-slot class 10/8,GPRS mobile station class B
• Power supply range: voltage is 3.7... 4.2V or 4.6-5.2v; current is 1A or more (the current is very important).
• Low power consume: 1.5mA (sleep mode)
• Operating temperature range: -40℃ to +85℃
• Communication interface: The TTL level serial interface compatible 2.85 3.3 5v MCU
• Size: 48*51mm