Saian professional strength ultrasonic skin scrubber combines two facial treatments in one compact, hand-held, wireless machine. Used on moist skin, the deep cleaning mode exfoliates and thoroughly cleanses the face with ultrasonic vibrations that remove dead skin cells, dirt, and sebum. The skin immediately feels smooth, even, and soft. The second mode uses sonophoresis for an enhanced application of Saian moisturizers, serums, and other anti-aging products. Speed of vibration is 28,000 (28KHz)