1、Temperature Humidity Sensor: The digital temperature and humidity module is a temperature and humidity composite sensor with calibrated digital signal output and supports for Rtu Over Tcp and for Tcp protocols. 2、Network Communication: The host adopts Gsm, 3G, 4G network communication, which is not limited by distance and can be used anywhere. 3、Voltage Detection: The host has a built in microprocessor to monitor the voltage value of the power supply, so there is no need to purchase a professional monitoring voltage probe, saving costs. 4、Automatic Reporting: Users can set the daily fixed point or periodically automatically report the current status to the first user number, and can remotely query the alarm history via Sms. 5、Humanized Design: The alarm supports 10 authorized user numbers, which can receive alarm Sms when alarming, and the last 5 authorized numbers can also receive alarm call reminders.