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Elevator plays an important role in our life,when our hands are occupied,the button is becoming a problem.Second choice is designed specifically for a key selection mechanism of the elevator design.when our hands are inconvenient,we can choose to use other parts of the body to block light emitted by induction button,thus the key trigger sensor inside the elevator through the sensor,the projection out of the floor numbers.You can then choose floor to complete occlusion of digital projection.Second choice,the key mechanism is also applicable to bet enough chirldren or disabled people in wheelchairs.So you can take the elevator more conveniently
Dalian Minzu University
Dalian Nationalities University