Unique: Portable high-power red LED flashlight can be used to help anyone find the veins under the skin. Its slim and lightweight design makes it very easy to carry and ideal. Powerful display: You may be surprised when you see veins that are invisible to the human eye. The light frequency of -700 nm is naturally absorbed by the blood and produces the shadow of dark veins. Clarity: You can easily find the exact location of the patient's vein ony type of tissue Avoid looking directly: medical cold light is safe for your eyes. Newborns and infants should avoid directly exposing their eyes to the light source of the instrument during use, otherwise it will cause eye discomfort.