SIM900A V4.0 GSM GPRS Wireless Kit
The SIM900A V4.0 GSM GPRS module supports 2G/3G/4G SIM cards and operates on 5V or 3.5–4.5V input. With TTL serial compatibility (3.3V/5V), ESD protection, dual antenna options, and low power standby, it ensures stable wireless communication.
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