The sounds

The sounds made by the preps are real sound, which can be found online. I know this because my preps makes noises as if they are banging the wall and an owl bird hooting sound, which only I can hear. Therefore the device they use is a microphone which only pick up noises which they want you to hear, you can never hear background noises. This could be similar to a radio microphone. Currently, I have no suggestions on how they are able to manipulate what a person see or smell, if anyone has any suggestions please inform me. As it is one of the biggest challenges, for targeted individuals. Also, please post down suggestions on the type of microphone that could be used.