Our SIMCOM SIM900D GSM/GPRS kit is repackaged to allow it to function as a gizDuino (Arduino Compatible) Shield as well. New features includes buffered 5V tolerant UART port for worry free interfacing between 3V to 5V host MCUs.

• What happens if my GSM SIM900D shield is not Power ON?
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• Is the gizDuino GSM SIM900D shield need to use an external power source?
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