Indoor Camera Siren - Purpose and Use

Am I right in thinking that the Indoor Camera siren can only be activated manually? I’m talking about the small $59 indoor camera. There’s no option to link the siren from one indoor camera to another. There’s no option to enable the siren when motion is detected. Am I missing something here? If I’m not missing something then the siren is useless. Please add a feature whereby the siren can sound on motion detection. Please add a feature whereby linked devices can trigger the siren on other indoor cams.