The invention can provide a miniaturized noise filter. The air treatment member comprises a filtration member housing that is detachable when the portable cleaning unit is in the first configuration and when the portable cleaning unit is in the second configuration. The torque motor includes a rotor and stator with permanent magnets arranged on the rotor and with armature windings located in the stator. The first bushings with flanges fixed in both sides of the bore of the boss can be a double-structural member including an outer tubular member and an inner sliding member fixed in the bore of the outer tubular member respectively. Multiple PCDs may be distributed on a PCB to compensate delay differences for multiple pairs of unequal length bifurcated clocksignal lines.