Have a two way audio device if you do not want to have a camera in a certain space and you want to yell at the person. If your medicine cabinet is in the bathroom, you do not want a camera in their. The door sensor is on the door, so when it is opened you can yell at whoever is in the cabinet.
I’m not sure if Wyze could make such a device any more inexpensive than a V2 camera. If that’s the case, then using a V2 and simply putting tape or a sticker over the would do it. Or you could mount it with lens right up against a surface, which has the benefit of aiming the speaker out into the room.