Hello, The 80k fat-blasting head will gradually feel warm as the frequency increases, but it won't be particularly hot. As long as you feel the frequency sound, it's normal, so don't worry. 

Hello, Sorry to hear this. This is not an electric shock. The 4-pole head is a radio frequency head,If the energy is turned up very high and it is suddenly placed on the skin, it will feel like a touch of pain because it generates focused heat. To operate the RF head, you can first adjust the energy by 1-2 levels, then apply the product, touch the skin and move it slowly. If you open it up all at once and put it on your body, few people can bear it. 

Hello, As long as it is a skin care gel, the brand is not limited. You can also choose essential oils, creams and lotions that are rich in moisture. Thank you 

Hello, 80k is just a slightly higher frequency than 40k, but the functions are the same. If you are sensitive to the frequency sound of fat-blasting head, you can try 40k first, but for those who have not used it, 40k and 80k are the same.