What is the correct frequency to use RF skin instrument?

RF means radio frequency widely use for beauty care.
Same series RF beauty instrument have very close function, even device and using way different.
We recommend each usage time 15-20 minutes each day, the first week keep usage 2-3 times is enough,
3-4 weeks as a course, after some time keep use it again to stay good effect.
Thermage, wrinkle remover and skin rejuvenator own to this range.

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