The PRO version has more advanced features.
Sensors:
Vibration: Analyzes and captures the lowest noises
Signal Strength: Analyzes the intensity of the emitted frequency
K2 sensor: It captures the intensity of the electromagnetic field, this sensor does not capture physical energy, electrical wires, sockets, wifi, etc... Only fields emitted by possible spiritual presences.

Just be warned it's not for the faint hearted, this can be a terrifying experience if you've never touched a Spirit Box before, so we recommend that you research the ghost box before you decide to try one for real.

Use at your own risk, I cannot be held personally responsible for you or any results (paranormal or otherwise) of using this app!