This is the text book I use for high school students.
We have to explain about these pictures which are popular in Japan, but probably are not familiar in other countries.
Can you explain these pictures?
The answers are ---probably---
1, It's a kind of buzzer, you push this button in order to call the waitstaff anytime you want service.
2, It's a kind of spatula, it is designed for cutting and eating okonomiyaki or monjayaki not just for cooking it.
3. It might be interesting. You press the button to make a flash sound so that people don't hear any bathroom noise.
Well, about No,3 -- I did a search and found this explanation. I really thought "Oh, I get it".