A machine for constructing modular water spray configurations with one or more flexible modules containing one or more conduits, communication between one or more modules and of one or more other modules, structure to interconnect modules, and communication between at least one module and a water source. The light-emitting element includes n EL layers between an anode and a cathode, and includes a first layer, a second layer, and a third layer between an m-th EL layer from the anode and an th EL layer. A vacuum line applies vacuum pressure to the cavity to capture a portion of the urethra and a portion of the prostate into the cavity. The controller may reduce an effective voltage across the thermoelectric device to reduce power consumption of the thermoelectric device. The control ball is movable in the hollow space in the control rod’s axial direction and is preloaded by the spring against the locking balls so that the locking balls, through the action of the spring and the control ball, are thereby preloaded to assume a protruded position in order to engage in one of the groovesrecesses.