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GSM/GPRS Modules SIM300/340 GSM/GPRS Module Tri-band or Quad-Band GSM/GPRS solution in a compact plug-in module for voice, SMS, Data, and Fax with low power consumption. More... SIM900/900D GSM/GPRS Module An industry-standard interface delivers GSM/GPRS 850/900/1800/1900MHz performance for voice, SMS, Data, and Fax. More... Compatibility Table SIM 3XX SIM 9XX - SIM900 SIM300 / SIM340 SIM900B SIM300C / SIM340C - SIM300D / SIM340D SIM900D SIM340E - SIM340D VS SIM900D PIN Name PIN No SIM 340D SIM 900D VRTC 15 1.8V 3V ADCO 29 0~2.4V 0~2.8V NC 47 NC PWM SIM340 VS SIM900B Difference SIM 900B SIM 340 VRTC 3.0V 1.8V ADCO 0~2.8V 0~2.4V Firmware Upgrade Main serial port & debug serial port Main serial port Keypad 4*5 5*5 See also Certification

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