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What is the circular camera on the roof of the community?

The ring camera on the roof of the residential area is a security system of the property, which is mainly used for the security management of the residential area. Installing a camera can replace manual patrol, and at the same time, it can trace the past events in the monitored area. There are no other regulations except that the public security department requires that the surveillance video data be kept for not less than 7 days.