A cosmetic instrument for applying a beauty treatment, the cosmetic instrument being capable of reading a memory card encrypted with an encryption key, comprising: a first housing; a second housing, assembled with the first housing to cooperatively form a shell having a chamber; a massage head mounted on a first end of the shell, the massage head extending into the chamber; the massage head comprising an annular base portion, a protrusion portion, a number of light emitting diodes, and four electrodes; the protrusion portion is positioned in the center of the base portion and is cylindrical with one end is closed to form an closed end; the light emitting diodes and the electrodes are mounted on the annular base portion surrounding the protrusion portion; the electrodes being configured for generating electromagnetic wave in a specific frequency; a control panel comprising a display panel, control panel being mounted on the shell beside the massage head; a micro controller unit and a drive unit positioned in the chamber and electrically connected with each other, the micro controller unit further being electrically connected to the control panel and the display panel; wherein the first housing and / or the second housing define a card insertion hole, the micro controller unit is configured to read information from a memory card inserted into the card insertion hole and generate reminding information for a user, the micro controller unit is preset with a decryption key corresponding to the encryption key of the memory card, wherein the decryption key and the corresponding encryption key match with each other; the display panel is configured for displaying the reminding information and function keys; the micro controller unit is configured for triggering the drive unit according to input command from the function keys; the drive unit is configured for outputting executing command to the massage head and sending feedback signal to the micro controller unit, the micro controller unit is configured for processing the feedback signal and generating a result; and the display panel is further configured for displaying the result to remind the user to operate the cosmetic instrument. a first housing; a second housing, assembled with the first housing to cooperatively form a shell having a chamber; a massage head mounted on a first end of the shell, the massage head extending into the chamber; the massage head comprising an annular base portion, a protrusion portion, a number of light emitting diodes, and four electrodes; the protrusion portion is positioned in the center of the base portion and is cylindrical with one end is closed to form an closed end; the light emitting diodes and the electrodes are mounted on the annular base portion surrounding the protrusion portion; the electrodes being configured for generating electromagnetic wave in a specific frequency; a control panel comprising a display panel, control panel being mounted on the shell beside the massage head; a micro controller unit and a drive unit positioned in the chamber and electrically connected with each other, the micro controller unit further being electrically connected to the control panel and the display panel; wherein the first housing and / or the second housing define a card insertion hole, the micro controller unit is configured to read information from a memory card inserted into the card insertion hole and generate reminding information for a user, the micro controller unit is preset with a decryption key corresponding to the encryption key of the memory card, wherein the decryption key and the corresponding encryption key match with each other; the display panel is configured for displaying the reminding information and function keys; the micro controller unit is configured for triggering the drive unit according to input command from the function keys; the drive unit is configured for outputting executing command to the massage head and sending feedback signal to the micro controller unit, the micro controller unit is configured for processing the feedback signal and generating a result; and the display panel is further configured for displaying the result to remind the user to operate the cosmetic instrument.