x2pcs SIM800L GPRS GSM Module PCB Antenna SIM Board Quad band for MCU Arduino
Chip: SIM800L
Voltage: 3.7-4.2V
Support networks: China Mobile, China Unicom and global quad-band network
Module size: 2.5cmx2.3cm
TTL serial port for serial port, you can link directly to the microcontroller. No need MAX232
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
Suitable for xDrip Parakeet project
Caution!
: This module itself uses input voltage of 3.7V – 4.2V. Therefore, if
you directly connect the Vcc pin to Arduino 5V pin, it might damage the
module as well.