Sugu ni mantan! Power Meter!!

The Cyan Switch is a Japan-exclusive e-Reader card for use with Super Mario Advance 4: Super Mario Bros. 3. It was released in Series 2 in Japan. It can only be used in World-e.

Once scanned, the Power Meter is halved, making it much easier to run and fly throughout stages.

Japanese
すぐにまんたん! パワーメーター!!

Translation
Fill it up right away! Power Meter!!