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The design of Energy-saving switch helps you preserve the energy before you realize it.
There is some degree of slope between the rotary button and the back cover of the switch.
The two dimensions stay in parallel when closed. As long as the switch was rotated, two
dimensions will create friction. Higher the power, bigger the friction. The bottom of rotary
switch is covered with rubber which increase friction and protect the surface of rear cover.
So unless users is intend to turn on the maximum power. It is not easy for users to turn to
the maximum power, therefore preserving energy .