The cleanser is a kind of instrument that uses the ultrasonic wave principle and uses the battery to drive the fine hair of the face brush. 

The advantage is that it can control the vibration speed of the face brush by adjusting the gear, so as to control the cleaning strength. It can adjust the strength according to the position, so as to avoid the damage to the skin caused by too much force. 

It can also penetrate into the pores and remove dirt and grease. Can better clean to the dead corner of the face. The disadvantage is that if the face brush is not clean, it is easy to breed bacteria, which is not good for the skin when cleaning the face.