Why is there no sound on the 360 surveillance camera?

There is no prompt tone because your camera does not turn on the voice prompt function. If your camera is connected to a mobile phone, you can click "Camera Settings" on the mobile phone and then click "Voice Prompt" to open it. If you haven't connected your mobile phone, you can press and hold the reset button with a toothpick to restore the factory settings, and then there will be a prompt.