High-frequency vibration magnetic levitation motor, brush cleaning, smart over-pressure alert, delicate on gums, custom cleaning modes | Stainless steel metallic brush head for efficient clean. Custom cleaning modes | Stainless steel metallic brush head for efficient cleaning. Try the 2nd generation magnetic levitation acoustic wave motor independently developed by experts from Germany and Japan. The vibration frequency is 31,000/minute, easily removing stubborn stains from the teeth. After the motor upgrade, it is smaller in size, produces less noise and movement, and offers more comfortable brushing. An attentive assistant, taking full care of oral health problems