Assisting users with controlling, navigating and performing any number of other operations for a secure storage apparatus is contemplated. This device includes a pair of electrodes and generates pulse trains consisting of a series of electrical pulses applied to the electrodes. The accommodating mechanism comprises an accommodating body extending in a direction departing away from an interior part attaching hole formed in the headlining, and also comprises a guide portion for guiding the connector to a predetermined position in the accommodating body, and a holding member for holding the connector at the predetermined position. The circuit unit is located inside the charger cradle, and the power cord connects to the circuit unit, whereas the connector connects to the power cord. Because the first edge of the plurality of false ZCP level signal substantially corresponds to the switching-off signal of the commutated-off excited phase, a first false ZCP masking signal having pulses wider than the ZCP pulse signal are applied to mask the first plurality of false ZCP signals.