The circuit diagram is simple ... data pin of the transmitter module. You can refer to the image below for a clearer view of the circuit connections and placement in the helmet. All the modules are ...

👍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 ...