# GSM 2G gateway
# Compatible parts
|Module||Purpose||Where to Buy|
|A6||GSM GPRS module||compatible parts list (opens new window)|
|A7||GSM GPRS module with GPS||compatible parts list (opens new window)|
# Hardware setup
|Module Pin||NodeMCU / ESP8266 Pin|
|VCC5||MOSFET driven by D5|
For VCC5 you can power it directly all the time with an USB cable or use a MOSFET like here (opens new window)
Don't use the nodemcu/wemos 5V pin for the A6/7 power, use a dedicated power supply for both or dedicated to the A6/7 with at least 2 amps ability.
So as to start your A6/7 module press the red button for 4 seconds, or link the PWR_KEY GPIO to VCC5.0 for the same time.