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Question:

To indicate that the air raid alarm is released, what is the law of the siren?

To indicate that the air raid alarm is released, what is the law of the siren?

Answer:

3. Release the alarm: use: to lift the alarm is in the air raid or war temporarily relieved. Tweets: continuous light for 3 minutes.
2. Air raid alarm: Uses: Air raids are issued when the enemy is going to attack us. Call mode: Ming 6 seconds, stop 6 seconds, repeated 15 times for a cycle. Time is 3 minutes.
1. Pre-alarm: use: pre-alarm is in the enemy attack on our side when there is a warning, requiring personnel to start evacuation. Call mode: Ming 36 seconds, stop 24 seconds, repeated 3 times for a cycle, time for 3 minutes.

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