What is the difference between a serum and a moisturizer?

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Derma Pro is a cosmetic tool that has been built in order to improve the appearance of one's face without the need for surgery. You can hold it over your face just like a pen and move it wherever you like without any difficulty at all. This device imparts oxygenated heat massage therapy to the skin in order to improve the tonal texture of one’s face with the help of microcurrent impulses at radio frequencies.

http://www.youtube.com/watch?v=4trmJwAG2oY