When a name of a station is heard, press the purple button under the station name. You can replay it by pressing the blue play button. The list "time" will record the time how long you need to press the button.
The purpose of this game is to help you to memorize the Japanese name and their pronunciation of the stations. I think it will be excellent if you can do every time less than 3 seconds, in average less than 2 seconds and no sound replay.