This is Ultrasonic Sound Application Audio with High Sound Quality. In general, our ears are sensitive to sound waves in the frequency range between 20 Hz - 20,000 Hz, which is called audiosonic sound or also called audible range (sound that can be heard). Meanwhile, sound waves with frequencies above 20,000 Hz are called ultrasonic sounds. To use this audio, use earplugs and set the volume to maximum and keep it away from children and the elderly, besides that, make sure the audio doesn't disturb other people and use remote audio control (Bluetooth). This High Sound Ultrasonic Sound can also be heard anywhere even when you are not connected to the internet or offline.