1, For ultrasonic beauty cavitiaton machine ( lost weight , slimming), 2, 28, 33, 40, 50 Khz Accessory :Ultrasonic Generator Our ultrasonic transducers are used for Ultrasonic lost weight machine , thin face and other ultrasonic beauty machine . Frequency : 28Khz, 33Khz, 40Khz, 50W ,also has 1 mhz, 3mhz , 500khz and other piezo transducerAlso supply PCB drive those transducers ,with sweeping , ...