Techniques are disclosed for interacting with a computing device using a stylus. During the period that the main water is shut off, the water pressure in the water pipes is continuously monitored to detect a water leak in the building. When exiting the power save mode, the control circuitry second initializes the first VSM using the VSM initialization code stored in the second VSM. In addition, a screw going through both passage openings goes through the sleeve opening, and attaches the first construction part to the second construction part.