A drive control circuit generates switching drive signals for a single phase of a multiphase voltage regulator. Before an operation of connecting both male and female housings is started, a protector is inserted into a fitting space between the operating portion of the slide and the casing. The memory array has non-volatile memory cells arranged in columns and rows. The first and second portions are affixed to each other to provide a preformed building block with a high compressive strength. The coating may have a relatively smooth surface roughness of \u22662. Each microphone is mounted with a microphone boot in a side opening and is isolated from the microphone array carrier by the microphone boot.