Smart devices: how everything in your house is watching you

Consider this: you buy a nice shiny new pair of headphones. When you unbox the headphones there's a manual that says'download our app to set up'. So you get the app, you create an account, you connect your headphones. You very much enjoy the sound quality. Even though the purpose of this app is to'set up' your headphones, it also provides a gateway to your behaviour.