Water injection gun using voice vacuum technology, accurately provides nutrients needed for skin in the depth of 1.28mm under the dermis.It is the principle of lifting the skin slightly by using sound pressure before micro-needle entered. The needle injects nutrients (such as hyaluronic and collagen) by using multi-needle sticking in the accurate depth after keeping skin tight.Injection rate can be easily adjusted through the button on OLED panel behind the device.Furthermore,the pressure of syringe had been liberalized before micro-needle was out,it will not bring the loss of nutrients.