product description: ? The smallest SIM800L GPRS GSM module MicroSIM card core BOARD quad-band TTL serial port ? description: Chip: SIM800L Voltage: 3.7-4.2V Support network: China Mobile, China Unicom and the global quad-band network Module Size: 2.5cmx2.3cm TTL serial port for the serial port, you can link directly to the microcontroller. No need for MAX232 Power module automatically boot, homing network Car signal all the way to light up. It blinks slowly when there is a signal, and blinks quickly when there is no signal ? Package Included: 1 SIM800L GPRS GSM module
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