An outer casing is partitioned, in a plan view, into a high-voltage transformer drive circuit block for disposing at least a high-voltage transformer drive circuit, a high-voltage transformer block for disposing at least a secondary side of a high-voltage transformer, and an ion-generating element block for disposing an ion-generating element. In some examples, a receiving device may connect with a sponsoring device having the digital content. The second laser is then positioned with respect to the strip and, with the second laser, the method then includes laser machining tab portions connecting parts to the strip in sequence along the strip, and separating the laser machined parts from remaining portions of the strip.