Pro Ghost Detector is an app that uses sensors in your mobile device to detect sources of variable magnetic emissions. Which could indicate us the presence of some kind of paranormal activity.
Not be shown magnetic fields at constant frequencies such as those generated by electronics, for example: TV, routers, computers, chargers, mobile phones, etc.
The app will show a green dot on the radar in case there is nearby a source of magnetic emission.
The detection range varies between 0 and 30 feet approximately, depending on the mobile device used.