I hope that cycling can save more effort, how to achieve it for D4S?

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You can use the moped mode and electric mode riding the D4S. To enter the electric mode, just turn on the power and twist speed handlebar. Step on the pedals but no twisting the handlebar and you’ll start moped mode. If you want to choose the 3 gears in the moped mode, simply press the M button on the display meter, the higher the gear you select, the greater the power it runs.

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