Please read the user manual carefully before using the device. Before each use, your skin must undergo a preparation process to open the pores. Always sterilize the probes with a disinfectant solution before and after each use. Please do not wash the device. Only the probes need to be washed and sterilized; the device is not waterproof. Do not use on damaged skin, open wounds, or scars. The absorption power is very high. It is recommended to start with the lowest power level and test it on your hand first. Do not hold the device in the same place for more than 3 seconds. The device must be moved continuously over the skin surface.