A watercraft includes a shell, a ride plate, an internal combustion engine, and a jet pump. The two sets of beam groups are interleaved by a beam combiner to provide on set of beam groups spaced apart by a distance V2. The media pack defines opposite inlet and outlet flow faces, with flutes extending in a direction therebetween. The at least one first conductive pad is disposed on the first substrate. A measurement module determines the number of transitions of the delay stages. The ultrasound energy preferably targets at the Periosteum or immediate soft-bone-tissue interface, where local sensory pain receptors are directly affected by the growing tumor, to generate heat to destroy local sensory pain receptors so as to interrupt or block the pain feedback pathway to the central nervous system.