What should I do if the door magnet for isolation is somehow lost?

You can report to the community and ask them to reinstall a door magnet.

In order to ensure the prevention and control of epidemic situation and the correct use and technical cooperation of door magnetic alarm in the future, the grass-roots political department has established a WeChat technical group with door magnetic equipment suppliers and street offices, pushed the recorded door magnetic alarm installation video and equipment installation flow chart in time, and gave feedback and docking on technical problems at any time to realize "cloud guidance" within the technical group. When residents with intelligent door magnetism come in and out, the intelligent door magnetism alarm will give an alarm after sensing the information of people's passing. Community workers can receive alarm information through mobile App, computer client, WeChat official account, telephone and SMS, and keep abreast of the entry and exit of people who need to be isolated at home.