A centrifugal pump includes a rotating blade member including an impeller member and a rotor magnet provided under the impeller member, a metallic main body casing in which the rotating blade member is accommodated, and a coil portion configured to rotate the rotating blade member. Such closing action may be triggered manually but can also be triggered automatically when the pocket is moved away from an upright orientation or experiences a jolting action. And in accordance with one of these illustrative embodiments of the invention, the set of instruction codes is transformed by permuting the bits of the instruction code in a specific manner based on the individual key.