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SIM900A V4.0 Kit Wireless Extension Module GSM GPRS Board Antenna Tested UK

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VCC_MCU when the SIM900A module and 5V TTL level communication, this pin is connected to DC 5V; when the level of communication of SIM900A and 3.3V TTL, this pin is connected to DC 3.3V.
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Time left:14d 7h 6m
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