He decided to go with the low-cost SIM800L GSM modem, but as it only works on 2G networks, provisions have been made in the board design to swap it out for a more modern module should you desire.

The ESP8266 WiFi module is the latest, made interesting because it pretty much doesn’t exist outside China. Why is it cool? It’s a WiFi module with an SOC, making it somewhat similar to TI ...

👍Support WIFI and GSM dual network(you can use GSM if there is no WIFI, The WIFI only can work with 2.4G, not work with 5G), Different alarm status: away arm, home arm, delay arm and timely arm ...