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Why is it that the longer the residential property monitoring and preservation time, the greater the cost?

Hard disk capacity. Property management refers to the activities of owners to maintain, conserve and manage their houses by hiring property service companies, and to maintain environmental sanitation and related order in the property management area. The longer the storage time of residential property monitoring, the greater the cost, because the longer the storage time, the higher the memory card capacity is needed. Monitoring system is one of the most widely used security systems, and video monitoring is the mainstream now.