We are manufacture of ultrasonic transducer , which are used for ultrasonic beauty equipment , frequency 1mhz, 40khz, 28khz, and so on Type Resonant frequency Size Power ( KHz D* H W HNM-4SS-1540 40 KHz 18* 56 20w HNM-4SS-2540 40 KHz 30* 50 30w HNM-4AH-3540 40 KHz 45* 55 60w HNM-4SS-3540 40 KHz 35* 55 60w HNM-4SS-3828 28 KHz 45* 79 70w HNM-4SS-3833 33 KHz 45* 61 70w HNM-4SH-3840 40 KHz 48* 52 70w HNM-4SS-3840 40 KHz 40* 58 70w HNM-8SH-3833 33 KHz 48* 61 70w HNM-8SE-3828/ 40 28/ 40 65* 70 70w HNM-8AS-2535 34 KHz 25* 150 50W HNM-8AE-2540 40KHz 28* 72 50W HNM-4P1-4325 1MHz 43* 14 20W HNM- 4P1-2316 1MHz 23* 14 15W HNM-4P1-4725 1MHz 47* 29.5 20W