Kindly follow the steps below to further check：
Increase the doorbell and homebase volumes in Aosu app
Setting Chime SettingShorten the distance between the doorbell, homebase, and router to make sure the devices are getting a stable signalIncrease the volume of the phone’s speaker.
If it still doesn’t work, please send a video of the problem to online support on the aosu app, which will help us analyze the problem and provide further assistance.