1. The input is a switch signal. When the input port is short-circuited to the ground (GND), an alarm message will be sent to the preset alarm phone, or call the set alarm number. The content of the alarm message can be set by yourself
2. It is simple and convenient to use, can be well embedded in other equipment, and act as a remote alarm working system
3. The alarm content of 1 alarm input and the alarm content when it is restored to normal can be defined by yourself
4. Built-in rechargeable lithium battery, usually in a charging state, when the main power is off, it will provide power and send an alarm message to the preset number
5. Power supply: DC 5V-15V
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