SIM800L GPRS GSM Module w/ PCB Antenna SIM Board Quad band for Arduino

SIM800L GPRS GSM Module w/ PCB Antenna SIM Board Quad band for Arduino
Model: SIM800L (over SIM900)

Working voltage: 3.7~4.2V(peak current 2A, please handle)
Support network: China Mobile, China Unicom
Module size: 2.2cmx1.8cm
The serial port is TTL serial port, which can be directly connected to the microcontroller. Don't need a MAX232

When the module is powered on, it automatically starts up and searches for the network
Onboard signal indicator (blinking slowly if there is a signal, blinking at short intervals if there is no signal)