How to set the doorbell of Agile?

The doorbell setting method of Agile is as follows:

1, the house area is small, as long as there is a doorbell on the security door.

2. The building area is large, the master bedroom is far from the gate, and there are elderly people with poor hearing.

3. Agile, a well-known high-end real estate brand company in China, is a comprehensive enterprise group with real estate as its main business and diversified businesses in parallel.