Ultrasonic transducer can be used in industrial cleaning and welding application. The most common frequency are 20KHz, 25KHz, 28KHz, 40KHz, 68KHz, 80KHz and 120KHz for cleaning and 15KHz, 20KHz for plastic welding. The output power are 30W, 50W, 100W, 1000W, 1500W and 2000W etc..