It is a secret weapon that "concentration always lasts!" Music / BGM (ASMR) that enhances concentration.

The natural sound of the sound of the waves creates a "concentrated state" with BGM, which is the optimum intermediate state between tension and relaxation.
With the Pomodoro concentration method, you can concentrate for 30 minutes and take a 10-minute break in a planned manner to take an effective break that keeps you "concentrated".
Use it to improve work efficiency and time efficiency.