Working principle: Sonic cleaning is vibrations of sound waves and different vibration frequency can separate the different medium? so the dirt inside pore will be vibrated out. The brush can take the rest of the dirt away. Features of the product: 1 Soft hair! It does not hurt your skin. 2 A small light weight? long handle design can be used more convenient. 3 brush head is replaceable? brush life can reach four to five months. 4 terrificcleaning effect. Attention: Please do not use in bath or shower. Please remove the brush head to rinse when cleaning it. Install batteries and brush head is important to note that firstly spin counterclockwisely and then pull out. How to use: 1? Wet your brush; 2? Put the right amount of facial cleanser in the brush head; 3? Whirl repeatedly to clean your face; 4? Wash your face