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GSM GPRS SIM800L Quad Band module plus antenna
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GSM GPRS SIM800L module, compatible with Arduino and other development boards, the smallest GSM module, Quad-band TTL, serial port, with antenna included.
Specifications:
Chip: SIM800L
Input voltage: 3.7 - 4.2V (battery or source)
Logical voltage: 3.3VDC ( ATTENTION, IT IS NOT TOLERANT TO 5V!)
Supported networks: Quad-band
It does not require MAX232, having TTL serial port, it connects directly to the development board.
Automatic booting
Status indicator LEDs: blink slowly when there is a signal, blink quickly in the absence of the signal
Login:
It needs a voltage divider on the RX pin when used with 5V development boards!