The strength of the radio wave of mobile phones and WiFi is displayed numerically in real time. You can search for places with strong or weak radio waves and paths for radio waves when communication is unstable in a building.
With the sound function, you can also notify the reception status of radio waves by sound.
If the radio wave is strong, it will be notified by high-pitched sound, and if the radio wave is weak, it will be notified by low-pitched sound, so you can grasp the radio wave condition by relying on the sound as a radio wave detector.