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About Linksprite MQ2 Smoke Sensor Detector Shield for Arduino

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I am writing here just to consult the questions about MQ2 smoke sensor.The photo of this item is attached,please check.I want to know this Shield has a long connector, that another Shield to fit?
How long is the connector and the gas sensor?
I would like for superimposing the LCD keypad shield.
Thank you!

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