Individuals do not need to apply for installing an alarm, but can install it directly at home. If they have a business license, they need to go to the public security bureau for filing and install it in their own shops.

An alarm refers to an instrument that sends out an alarm signal. Used to send out forecast _ alarm signal and cancel alarm. Air defense warning refers to the warning system set up in wartime to prevent enemy air strikes. It is an important part of urban air defense engineering, and it is an alarm to remind people of air defense when the city is threatened by air strikes.

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