A stacked semiconductor device and an associated manufacturing method are disclosed. In one embodiment, the light bulb has a side directed toward the surface and a light-absorptive barrier coupled to the side. If the input voltage is higher than the threshold level, the frequency of the gate signal is lowered so as to prevent the driving performance of the driving circuit from rising to an excessively high value. Traffic that is received at a PE from a customer is examined to identify whether or not the traffic belongs to the first service. The first leg has a first fastener intended to be hooked into the attachment and the second leg has a second fastener intended to be hooked into the slide.