A wireless dual technology displacement sensor (“displacement sensor system”) and method are disclosed. The displacement sensor system includes an analyzing sensor for determining a range to a measuring point and a trigger sensor for activating the analyzing sensor. The trigger sensor is an accelerometer or an optical proximity sensor (OPS), in examples. The analyzing sensor is preferably a time of flight range sensor. When installed as part of a door system having a door and door frame, for example, the trigger sensor detects movement of the door, and activates the analyzing sensor in response. The analyzing sensor then determines the range to the measuring point, such as the door frame. This two sensor system can be thus used to prevent the high current consumption of existing displacement sensor systems.