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metal touch sensor strip on both sides, when in use, your hands must hold the touch sensor on both sides, then the ion function can work. ultrasonic + positive ion: deep skin cleansing, remove dirt, excessive grease, melanin, cutin and blackhead. ultrasonic + negative ion: nutrition leading-in, improve the skin tone, reduce wrinkles and whiten your skin. tapping massage: massage and remove wrinkles, firming and lifting skin. it will automatically shut-off after 10 minutes of use.