For your reference, please take the following steps:
1. Go to the [Mi Home/Xiaomi Home] APP >> select [Device card] >> tap [...] at the upper right corner >> select [Camera settings] >> tap [Sound and light alert];
2. You can turn on/off [Sound and light alert] and set up [Sound alert], [Light alert], [Effective time] as you prefer.
Note:
1. Tap [Sound alert] and you can choose 3 sound effects such as [Alert tone], [Hello welcome], [Private area, please keep out]. Also, you can record your own voice as a sound alert;
2. Tap [Light alert] to turn on the light alert;
3. Tap [Effective time] and you can choose to [Any time] or [Custom schedule].