A swing that can charge smartphones has appeared in front of JR Kashiwa Station in Chiba Prefecture. A charging outlet is connected to the swing, and when you use the swing, it generates electricity. Depending on how the swing is used, it is estimated that you can recharge 3% of the battery after about one minute of swinging back and forth. By using the swing, many people, from children to the elderly, can experience the difficulty and importance of generating electricity. is swing charger was made in the Netherlands and was used by many people at a Dutch event.