Frequency : 1Mhz, 3Mhz , 28khz, 33kjz , 40Khz , Double frequency series , also supply item PCB( Driver) with adjustable power , sweeping and so on . They can be used for Ultrasonic beauty equipment , Ultrasonic medical equipment , Ultrasonic facial massager , Ultrasonic lose weight equipment and so on , transducer for beatuy equipment, such as for ears, varices, congestion, swelling of bump