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You can saving electricity due to this.
Every human could have a experience of not turning the light off while leaving the building or house.
By using the door knob that is unified with the light switch, you can turn lights off and turn the light
off when you leave the room entirely and it will be a easy task.
With this behavior we can save energy.
When you pull down the door knob , the room light's will lights off.
Cheonan-si, South Korea
seoul, South Korea
Changwon-si, South Korea
Gwangju, South Korea