1, principle of action: the skin is gently pulled up by using voice-activated negative pressure technology, and under the condition of keeping the skin firm, multiple needles are used to make the needles accurately enter the depths of the dermis and inject nutrients. The machine can accurately adjust the injection depth and amount of drugs, and safely inject dangerous parts such as eyes and neck. Operation characteristics: remarkable curative effect, quick response, no loss of nutrition, injection in dangerous parts, and application of anesthetic. Management: it belongs to medical behavior and needs qualified doctors to operate. Effect: the effect of the first water-light needle will not be too obvious, and the tender, smooth and full skin will be slowly exposed after the second time. Of course, the effect of a water-light needle can only last for 2-3 months, so it belongs to a maintenance project and needs to be cared in the driest period of the year or in a special period of the skin (after rough, sunburn or sound and light care).

2. Needle-free water light Needle-free water light is a very popular project in WeChat circle of friends recently. It focuses on the concept of "painless and non-invasive" to attract the attention of beauty seekers, and the effect is not lost. Needle-free water needle, like water injection needle, also needs needle-free injection equipment. Principle of action: Like mega launch, air pressure is used to explode nutrients into nano-scale molecules at ultra-high speed and penetrate into the bottom layer of skin epidermis, that is, the basal layer. Operating characteristics: Because it is a non-invasive project, there is no bleeding and no pain. Management: Because of the need to penetrate nutrients into the skin, and the composition of the water needle is complex, the ratio is also very strict. Therefore, it belongs to a medical beauty project and must be operated in a regular plastic surgery institution. Effect: Needle-free water-light needle is not as good as water-light needle because it cannot be injected into the deep skin. Generally speaking, the first injection duration of needleless water lamp is short, and it needs to be supplemented after 10- 15 days, and the obvious effect will be seen after three consecutive injections. Pay attention to drinking plenty of water, applying moisturizing mask and sun protection after operation, and the effect will last longer.