Instead of sitting in a restaurant waiting around for a waiter or waitress to make his or her way towards your table, you can press the call button, and your server will come hustling over.
Arcades are the same. Taito's arcades have call buttons that you can press. Doing so sends a staffer running over, ready to help you and answer your questions.
I saw this Taito button this morning at a batting cage of all places. The batting cage was simply using the same call button found in Taito arcades. I did not press it, however. I did hit about a hundred baseballs!