Place the SIM800L library folder into your \Documents\Arduino\libraries folder ... If you define and pass reset pin of your board you can reset GSM by external reset pin of the SIM800l GSMTime(time) ...

👍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 ...

Arduino Real Time Alarm Clock DS3231 with TM1638. Arduino Clock with Battery backup (real time clock), Time, Date, Alarm, Temperature, TM1638 seven segment module output and input, Display Sleep mode.