Frequency range :15-20KHZ Output power:1000-4200W Used in toys,electric,stationery ultrasonic plastic welding machine Processed by the digital controlling machine, so the precision ... 15KHz, 20KHz, 28KHz and 40 KHz for plastic welding. The output power are300W,500W,1000W,1500W ,2000W,2200W,2600W,3000W,3600Wand 4200W. high frequency plastic welding machine