... , jewelry, plastic processing, manufacturing, auto industry ultrasonic hand gun (hadle spot) welder is a general designation for all ultrasonic welding application ... ,28 kHz,30 kHz,38 kHz,40 kHzPower: 50W,100W,200W,300W,500WPower Adjusting: Step or continuousSwitch: handle or foot switchWorking ... , jewelry, plastic processing, manufacturing, auto industry ultrasonic hand gun (hadle spot) welder