A wiring substrate with tensile-strength enhanced traces primarily comprises a core layer, a plurality of connecting pads, a plurality of traces, and a solder resist where the connecting pads and the traces are disposed on a top of the core layer. The lower electrode is bonded onto the substrate. In the compressed position, the annular body is inserted into the mouth of the bag and the inward pressure is removed to allow the annular body to expand against the sides of the bag with sufficient pressure to hold the bag open and to hold the annular body in the installed position within the bag. The second audio signal is filtered using a second adaptive filter to obtain a second filtered audio signal. Thus, a user can use the first activator to generate air to produce bubbles, and can use the second activator to generate a stream of the liquid that can be aimed at the generated bubbles.