They are used to mask the sound of you doing business. Some play music and some play the sound of running water. I personally don't care for that particular fea

They are used to mask the sound of you doing business. Some play music and some play the sound of running water. I personally don't care for that particular feature, but Japan produces the best toilets in the world. If I ever own a home, I'll import a top of the line Toto.