How to use it?
Press this botton for one time,it will turn on.And it could be used .
The Grade 1 indicator light shows it was in the slight suction.
The Grade 2 indicator light shows it was in the Intermediate suction.
The Grade 3 indicator light shows it was in the Strongest suction.(Tips:please do not stay in one place more than 3 seconds,just slide up and down to prevent from purple and red skin.)
If you press the botton and hold for 3-6 seconds and it will turn off.