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Package include: 1 x 400W 60V switching power supply Adjust the white button to get the voltage you need.The voltage will rise when you adjust the white button clockwise,the voltage will drop when you adjust the white button counterclockwise.Then you can adjust to the voltage you need. Learn how to adjust the voltage from this link:https://www.youtube.com/watch?v=2APO1E06qUY&feature=youtu.be We do not recommend using this power supply to charge the battery, otherwise it may damage the power supply or affect the service life of the battery.