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Statistics shows 34% of burglars entered indoor through opened windows while people are in the habit of opening windows to ventilate home. Current sensors could only detect on/off status, which helps not much when users open their windows a little. Therefore, we provide an innovative function to maintain the detection after windows are pushed to positions so the arming state will stay when the windows are opened. Moreover, The multi-stage base suits various height differences between doors and frames. In summary, it provides the solution letting people ventilate homes safely, also solves the problem of high and low drop in the installation.