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Question:

I would like to know about "power failure automatic alarm"

I would like to know about "power failure automatic alarm"

Answer:

The market has not seen such a product, but can achieve this function, a microcontroller plus a phone line can get.
Power off after the automatic switch to the alarm circuit side, and then add a delay in the above head, you can delay the kind of 10 minutes. So do not play the effect of delay alarm it
This can be completely, but do not know there are wooden such a good design of the delay alarm, if not, you can let your electrician in your control system which adds a relay

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