A method of communicating an importance level of a call to a recipient mobile device is disclosed. The counterpiece is fastened to the horn by means of the screw and thus clamps the piezoelectric drives, which are arranged on either side of a longitudinal axis of the ultrasonic transducer, between the horn and the counterpiece. The positioning mechanism is released by pushing on a push button allowing, it to move along the slot. The enema of present invention is highly effective in the short- and long-term pharmacological treatment of ulcerative colitis. The invention also includes a kit for modifying a lawn mower to include a power-assisted starting mechanism. The invention also relates to said mixtures of collectors where the molar ratio of I to II is 1:5 to 5:1.