Ultima audio distance and volume concern

Hi, I’m a new user and just bought my first product product named Ultima to improve my learning skills.
I have a concern about the distance and the volume of the speaker.
Is enough for the audio to be effective, listening to the minimum volume possible while hearing the water?
I do not want to.damage my hearing.
Thank you.

Congratulations on beginning your subclub journey. For the audio to be effective, you should listen to it at a comfortable level. Due to the nature of Ultima (masked and ultrasonic scripts combined), playing it at the minimum level where you can just barely hear it may prevent you from hearing the ultrasonic portion of the product.

I’m listening to 70db.
I feel the ultrasonic and the water.