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It is a new way of the key box, also a new way of green life. Redistributing the circuit
that each room matches each switch and combining the key box with switch device.
When we leave the house, we take out our keys and turn off the switch of our own
room.This new key box is very convenient and save our power just in daily life.
National Kaohsiung Normal Universit
National Kaohsiung Normal University