• Chip : SIM800L
  • Operating voltage : 3.7-4.2V
  • TTL serial port for serial port, you can link directly to the microcontroller. No need MAX232
  • Module size: 2.5cm*2.3cm
  • Power module automatically boot, homing network
  • Onboard signal lights all the way . It flashes slowly when there is a signal, it flashes quickly when there is  no signal
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