AThese 2 kinds of vibrations are both acoustic vibration.

AThe default treatment time is 15 minutes. Please restart it for further continuous use. The recommended usage time is : 1. micro vibration cleaning: depends on your habits 2. ultrasonic deep cleaning: 3-5 minutes for whole face. 3. EMS + vibration: for 10 minutes (5 minutes for the left face and 5 minutes for the right face)